You’ll still get low-down loans from FHA on first buyer programs, but otherwise, I foresee a lack of greater than 10% 2nds.
A 15% 2nd will be available, however I suspect the banks will make it very unaffordable in terms of rate on the 2nd, and possibly higher rate on the first.
The banks are quickly realizing lack of skin in the game from the borrower is the leading indicator for default.