The track that the US political economy is on with the feedback loop caused by government backed fixed term fixed interest loans requires an ever increasing LTV, meaning newer entrants in the housing market will have to accept increasingly precarious positions.
The 30 year fixed mortgage is an insanely good deal, and I say this as a guy who has one. The monthly cost can only stay the same (and decline due to inflation) or decline if interest rates fall and you refinance or adjust the loan. If interest rates go up, you're completely protected.
A mortgage may be more than rent for a similar place now, but I suspect it won't be that many years before the lines cross.