Disney has for the last few decades positioned itself as a premium product at a premium price (think the entry costs for theme parks, cruises, etc.) much the same way Apple has. They clearly think their content is worth the premium, so they're going for it.

Also, a lot of their best films are going public domain in the coming years, so they need to maintain and grow their revenue stream somehow.

Shedding ABC, eliminating physical media, and increasing streaming prices makes total sense if you think the way they do.