You're right, and I wanted to make iOS apps only for learning actually so I'll wait a while then..
Yes, but don't buy those horrible "new" mac minis, they benchmark MUCH MUCH less than the previous (2012) models, including worse internals. Refurb is the way to go, especially for a quad core.
Customers without a Mac will be able to compile with the hosted Mac cloud instead. It will not be a free service, however the price of this service will be relatively low.
There might be a native Mac IDE in the future.