I really don't think that you could move a susbtantial number of people with bikes to reduce volumes in other parks. I mean in the summer 95 degree heat biking that distance would be tough. It could be one option but there would need to be others. Even if you had a special dedicated direct TRAM path to the AK from the Transportation center would help.
Yeah, the closest I've been to the heat of summer was in May, and it was warm even then. I see bike trails as part of the adventure of going on vacation. Sometimes not as crowded, with turns and vistas without wall to wall people. A small journey into the "wilderness". I know it'll cost money, and there's no guarantee that people would actually use them. I also know that geography and obstructions might cause problems. But wouldn't it be great at several levels? I equate it to the mini golf courses. Nobody flies to Disney to play mini golf, but it's a nice diversion far from the maddening crowds.