Bus transport into core park areas is not isolated concept. I.e they have been doing it in Zion down south for many years. But in Zion they are doing it to prevent traffic jam; at O'Hara it is supposed to limit # of visitors.
Lake O'Hara Lodge has their own luxury shuttle that operates separately of National Parks worn out old school bus. And, 400$ was last time I checked several years ago. Now it is <<<drumroll>>> 1095/night
This is not conservation but dollar talk. There is support staff, kitchen, restaurant etc etc. I'd be first to sign petition to tear down these cabins. But it ain't going to happen; if anything they will build something else, while real outdoor enthusiasts will have to play lottery or walk 11km if they want access.