This is from Don Felder's book:
"In November [of 1990] Irving called to tell me 'We're on' [regarding an Eagles reunion]. [...] I arrived at a little rehearsal hall in North Hollywood. [...] Glenn was supposed to fly in from Aspen any day with two or three songs he'd written, but he never showed. He supposedly sent a message through Irving instead saying that he had his songs already written and would meet us in the studio. We carried on, rehearsing a couple numbers Don was going to sing and one great ballad called 'People Can Change,' which Don wrote for Timothy to sing. We all believed it was aimed at Glenn. [...] Over the next day or two, we started recording tracks that Don would sing, convincing ourselves that Glenn could come in later and play his guitar or add whatever he felt they needed. He kept putting us off until Irving arrived, stone-faced. 'Glenn's not coming to the party,' he said, his dismay evident. 'He's decided not to do it. It's over.'
[...]
We looked at each other and shook our heads in disbelief. Someone said, 'Well, if he doesn't want to do it, let's just go ahead without him.'
[...]
Glenn threatened to go to the press and say we weren't the Eagles without him. He said he'd even file a lawsuit to stop us from going ahead. He issued a series of increasingly angry statements, enough for us to say, 'OK, maybe we really shouldn't do it.'"
I agree with Glenn.
Hmm. I think we have our answer as to whether he'd want the Eagles to continue without him...