Thank you, Mason, for the clarification and the explanation. I will think on these things. I still feel I must criticize again, however, that the nature of at least part of your argument (mainly the final paragraph) has to do not with the Supper per se, but rather with the deficiencies of the participants. There is nothing inherent to weekly communion that causes people to "come away from the table with no change." There is also nothing inherent to weekly communion that means a church must "tack it on at the end" and "rush." I'm sure this happens, but it can happen in a church that does communion weekly as well as a church that does communion once per year. The fault there lies with the minister, not with the frequency of communion. While these carefully chosen scenarios may serve to illustrate your argument, they are just that—carefully chosen scenarios. And, in the case of my church, it is an absolute caricature. Your second paragraph is worthy of reflection, but your third paragraph has, again, failed to show the logically necessary connection between the problems you describe and the Supper per se.I do not think that weekly communion is inherently deficient and if I have given that impression forgive me. In times of extreme distress, revival, persecution, etc. I can see strong reasons to partake weekly if not more often as our sense of sin and Christ is providentially heightened. I am rather put off by those arguments for weekly (or more frequent) as the norm and if you disagree with them then you are some sort of Zwinglian.
That being said, I think weekly communion in the present day is wrong headed and I would petition my own session very strongly if they were to go that route. The Lord's supper is a nearer approach unto Jehovah in Christ and in a day of waning spirituality I think increasing the frequency of that near approach will almost do away with it all together. Different ordinances require a different degree of preparation and result in different degrees of communion with Christ. When the time for preparation and reflection isn't sufficient, we grow cold to the means of grace and take them for granted. So instead of the intended effect of communicants having a greater assurance of Christ and his love, the result can be presumption and coldness to the things of Christ. This can happen because the nearness experienced by the believer is not entirely or even primarily objective. Christ is present to those who receive him with the hand of faith, but faith isn't always lively and I am not convinced that the best way to awaken faith in the lives of sleepy believers is to administer the sacrament more frequently. Such a line proceeds on the assumption that more often = more grace; and we do not operate on this line with respect to any other means of grace. Lastly, I am not convinced that renewing my wedding vows are necessary as often as I tell my wife I love her. The Lord's supper is a renewing of one's engagement to the covenant and taking up the terms of the covenant; it is a renewing of vows. And I do not think the scriptural example best lends itself to renewing of one's vows every time he meets with his beloved. There are times and seasons for everything. None of these things are closed case arguments against weekly communion and they are not designed to be. Like Chris said, frequency is circumstantial. However, Christian prudence is involved in determining the frequency and the effect it may have upon the congregation is an important thing to consider.
The unintended result of more common observance of the Lord's supper is the less emphasis that is placed on it. I think we see this in Reformed churches today where the Lord's supper is tacked on at the end of the service and rushed with everyone sitting in their own chairs eating of the pre-sliced bread and wee cups. The zeal for the Supper has almost vanished. So a church may have the Lord's supper every week and folks come away from the table (or their seats) with no change. They felt nothing, sensed nothing, and are no different. Their renewing of the covenant hasn't happened because there was not much time for reflection, meditation, and examination even in the service. They may not even know their duty for such a thing, because all they heard was the form saying how we aren't Lutherans or Papists. There is a time for that, but what is it for? Tell the congregants of the blessing and give them food to chew on! It becomes an appendix of sorts. I don't think the Lord's supper should be an appendix, but rather a climax. A climax of nearness to Christ, sense of my sin, love to my brethren, and joy in the Holy Ghost. I don't think the right way to emphasize that is to make it more frequent at the expense of it's relative importance, but rather to slow down and be more deliberate in our celebration of the Supper in the life of the Church.