If Elvis had insisted on going on tour he could have done so. Nobody kept him from playing stadium gigs, but himself.

By the way: I am one of the very few here who agree with the thought, that Elvis wasn't the great guy a lot of folks made him look like. Especially in the later years, I don't think that I would have liked him too much (I simply cannot enjoy myself in company of armed junkies :traurig:).