I don't know what the numbers look like for prior years, but so far this year, this is what I see:
Total MAC players to portal: 167
Moved to P5: 35 (21%)
Moved to a different G5: 23 (14%)
Moved to FCS: 20 (12%)
As yet no reported destination: 89 (53%)
With another week, four additional MAC players are showing as having gone into the portal, with no more showing new schools. With the Spring semester underway, it would seem that most of the 93 MAC players not showing a school yet will not be with a new school for spring practice. Presumably, at least a few of them will join a new school for Fall, but I suspect that for a good number of them, their college football days are over. Still others may end up enrolling at some other school and walking on. This shows the decision to voluntarily give up one's scholarship and enter the portal carries significant risk. It can result in a better position, but the result can also be a worse situation, and the player can end up without a scholarship at all.