I like the idea of a time element to the rating system, but don't think it should be based on the number of games finished in the last month. Is there a reasonable amount of games we should be expected to play/finish in a given year (or six months) to be considered active? One a month? So, maybe our GR should be multiplied by x/12 (x = number of games played in the last year) so if you haven't played 12 games in the last year, your GR is zero, BUT, if you come back and start playing, as soon as you get up to 12 games your GR is fully restored, yet highly influenced by the 12 recent games you've just played?

Also, with someone like Berstein, he'll drop off naturally or a zero could be manually placed in this time factor to drop him off?