I will likely use exactly one Dodgers player from 1969-1975 on my Dodgers this season, and it'll be about my fifth best reliever. From my 112 win Astros team last year I also only had one Astros player 69-75. Those super-elite teams are actually the teams it wouldn't matter for all that much, whereas the middle of the pack teams like the Orioles, White Sox, and Phillies would all lose the huge innings pitchers that keep them even middle of the pack.
Anyways, I think rbow and schwarze are hitting on the right point, which is that we're turning over at such a ridiculously low rate that it seems like the worst possible time to start changing things up.