J.R.R. Tolkien was a funny one in terms of adaptions. On one hand, he declared himself of the opinion that LOTR was fundamentally unsuited to drama, and he famously tore apart the proposed 1950s Zimmerman script. On the other hand, as he neared retirement, his stated policy became "either give me lots of money, or give me a complete veto over stuff I don't like."
I actually think, given sufficient money, Tolkien might have given way on this. His true hate was for Disney - as long a Disney was out of it, there remains the possibility of a Beatles adaption, however slight.
What was his problem with Disney?