Access has improved for P5 teams as a whole because there are more of them. Creighton, Butler, Houston, BYU are now P5. It hasn't changed for individual teams.
16-12 Kentucky made the '85 tourney. 18-13 (6-8) Maryland was a 5-seed(!) in 86. 17-12 (6-8) Maryland was a 7 in '88
The heart of the issue is "access" for high-major programs, which is also misleading. Between conference expansion, reduction of non-con road games and metrics working in their favor, it's just as inclusive now for power-conf teams as it's ever been. I think Ken would agree.