I agree, I don't think the loan limit changes will have a big impact.
What will have a bigger impact are moves like RDN made today to align their guidelines with DU/LP. The MIs have been a pain to work with on the origination side the past few years due to all their overlays. Now that they are aligning more with Fannie and Freddie, they will get used more.
Also, the change in rules on LO comp will help prevent steering borrowers towards FHA loans.