I don't mind that at all as long as those that did buy a lifetime pass get something back for that. Like all downloadable content for free...
Way back when there was no concept of Seasons even, that came at the end of year one, after release. Lifetime Expansions means just that I think, clue's in the name, and I see no reason whatsoever to doubt, that stands no matter what the pay-to-expand model for non-owners ends up being. Some of the best gaming money I've ever spent already though, even so early, as (nearly) one season in. Long may it continue. Elite!