1. This is risky for consumers. Whereas the PPC->x86 move was clearly a benefit to consumers given how PPC was lagging Intel at the time, x86 had proven performance and a massive install base. It was low risk to consumers. This? Less so. Sure iOS devices run on ARM but now you lose x86 compatibility. Consumers need to be "compensated" for this risk. This means lower prices and/or better performance, at least in the short-to-medium term; and
1. This move is a risk for Apple. They could lose market share doing this if consumers reject the transition. They wouldn't undertake it if the rewards didn't justify the risk. They will ultimately capture more profit from this I'm sure but because of (1) I think they may well subsidize this move in the short term with more performance per $.
But I fully agree with an earlier comment here: Apple has a proven track record with chip shipments and schedules here so more vertically integrated laptop hardware is going to be a win, ultimately.