I consider 1992 as the start of a new era of college football. The "Dayton Rule" was taking effect. Conferences like the Big 10 and SEC started the expansion frenzy. So did some research and found some useless but somewhat interesting facts about what was I-AA and is now FCS football.

74 schools that were I-AA still are.
1 school was. Moved up to I-A. Moved back down.
22 schools that were D-II have moved up voluntarily.
1 school was D2 and moved up due to the Dayton Rule and is still I-AA.
11 schools were D3 and moved up due to the Dayton Rule and still are.
4 were D-III and moved up afterwards.
1 school started I-AA football but has since dropped it.
12 have started football and are still I-AA
2 were D-II. Moved up to I-AA due to the Dayton Rule but have dropped football.
6 were D-III. Moved up to I-AA due to the Dayton Rule but have dropped football.
I school was scheduled to move up to I-AA due to the Dayton Rule but decided to drop football before moving.
3 schools were NAIA.
1 school was D-II and is transitioning.
1 school was D-III and is transitioning.
1 school was NAIA and is transitioning.
1 school was D-II moved up to I-AA but moved backed down.
1 school was D-II started transitioning to I-AA but moved back down.
1 school was D-II started transitioning to I-AA but dropped football (and most everything else).
I school had a D-iii team at a different campus but has since moved it to its D-I campus and plays I-AA football.