72 makes the most sense, but 76 isn't much difference. There are 31 conferences, about 20 of them contribute 1 team every year, at least 8-12 AQs fall in the Q3-Q4 neutral court type teams anyways. Anything more would be bad
Whether it is...
4/4, Bottom8 conf AQs,(20) 8 16s(4), 4 15s, 4 14s, 4 13s, (8)play-in, 8 12s(4), (44)
20+8+44 (72)
6/6, Bottom12 conf AQs,(20) 8 16s(4), 6 15s(2), 4 14s, 2 13s, (12)play-in 4 13s(2), 8 12s(4), (44)
20+12+44 (76)
I think it will result in a minor shift in the overall tournament maybe one or two more upsets. The 12s-14s become more competitive, rare 15 or 16 seed upset instead of just 12s and 13s competitive, occasional 14, and rare 15 or 16 seed upset.
8 conf
31 SWAC(12) avg NET 309.75
30 MEAC(8) avg NET 301.50
29 NEC(9) avg NET 292.11, 3 not eligible
28 OVC(11) avg NET 284.18, 2 not eligible
27 Patriot(10) avg NET 263.8
26 MAAC(13) avg NET 260.85
25 AEC(9) avg NET 251.89
24 Southland(12) avg NET 235.25, 1 not eligible
12 conf
23 ASun(12) avg NET 234.5, 2 not eligible
22 Horizon(11) avg NET 230.09
21 Summit(9) avg NET 226.89, 1 not eligible
20 Sun Belt(14) avg NET 223.57
Top 2, Lipscomb 94, McNeese St 98, next 3, 105, 106, 113
It might even make a 15 seed game or 2 more competitive, which honestly isn't a bad thing.