Meh, Modrić is 26 and signed for a handful more years. He'd get more in wages for the remainder of his contract if he moved sooner rather than later (I suppose), so it might make financial sense for him to cash in, regardless of CL, etc.
No one ever said, iirc, that he wanted to go to Chelsea because of their guaranteed CL. It was because they'd double his salary (as would Man U.). CL would be a pleasant bonus (and part of why his inflated wages can be paid).
In three years, he'll have fewer years left on his contract, have three more years of 50+ matches a year on his clock, and won't pull as big a transfer fee. So I wouldn't be surprised to see him shifted soon. But I don't think it's this summer.
Incidentally, I worry that Everton away was a glimpse of a post-Modrić era, with Parker taking five minutes to move the ball into the box, as the entire offense runs through him. Painful.