Frankly, the way the way people act about his involvement I'm not surprised he doesn't want to be more involved. If he'd been more involved he'd have set the clock back to the day he left and had all the same questions and expectations from the self-entitled fans who think he personally owes them something for being involved in a show they loved.
Oh for god's sake, it's not
about that. He's part of something much bigger than himself. All the living Doctors did something for this, even Tom Baker who hadn't returned to Doctor Who
proper since leaving in '81. The ONLY one absent was Mr. I Have A Grudge Against People Who No Longer Work On The Show for Things That Happened in 2005. If he didn't want to do the 50th Anniversary episode because he's one of those John Hughes-type weirdos who go through some psychological process where they distance themselves from their past, fine. But he could've at least done this skit. He didn't even have to leave his living room to do it. And it's a damn shame. If he loves the Doctor like he says, he should've returned in some capacity for the 50th. Full stop. By not doing so it just makes him look like the guy at the party no one wants to hang around because he's so negative.
He would've gotten paid and he would've made people happy. If you say "I love The Doctor" and then not return for the 50th Anniversary celebrations when everyone else who is still living and played the TITLE ROLE is involved, it just seems disingenuous.
Edit to add: And in my theatre last night, at the end of The Day of The Doctor when all the doctors were saving Gallifrey, guess who got a louder cheer for his stock footage saying "And for my next trick!" than Peter Capaldi's eyes? Eccleston.
He dropped the ball by staying home. He should've been part of it.