It makes ZERO sense to me. Zero.
I was told RnRC would be re-themed to Guardians because, simply, the thought is no one gives a crap about Aerosmith anymore and it gives them a very, very easy and quick way to get Marvel into the park. The music tie-in is a perfect way to make it work. They have been looking to replace Aerosmith for years, and they finally have an opportunity - and one that costs them zero in licensing, too.
I was told nothing about WDW1974's info about ToT being converted, but it does seem to make some sense, I guess, if they are thinking about changing RnRC. I don't see where the tie-in would be between ToT and GotG, but it is obvious someone in Glendale is working on it and it's a HUGE coincidence.
That's a far cry from changing the entire Hollywood Blvd. to a GotG theme, though. I imagine, if it happens at all, it would just be one or both of those attractions, and nothing else.