I can see there few enough transfers from tis change in structure. I'd surprised if any mass exodus from any 2nd teams (where club have 1st team in SFC) to join 1st teams in IFC.
There is still an IFC for 2nd teams but they'll be winning it against other 2nd teams.
As much kudos as winning that "2nd team IFC" beating 2nd teams of Boden, Na Fianna, Crokes and Brigids etc as winning one against some of the 1st teams in AFL2 and AFL3.
Overall its a very welcome change of structure.