https://help.disney.com/articles/en_US/FAQ/About-The-Secret-...
See also: Artificial Scarcity
From that page: "this will allow us to focus on building new and more engaging games" - I'd like to hear them explain that!
One really cool thing that both remakes offer is the ability to seamlessly switch between the remake and the original: At any point in the game, press the correct function key (F10 in MI1 and F1 in MI2—not sure why they switched that) and the game morphs between the remake and original without skipping a beat—down to the dialogue, music, etc. It didn't really add anything to gameplay, but it was really cool.
The current course is: You build a game for console & Windoze, then wait 4 years, then maybe port it to iDevice, and probably never to Mac.
That's at least a relative improvement over before, even if it's still not really satisfying for folks that don't have a console or a PC.