Yeah.  Vader's got to lose this fight so the rest of the series can happen.  
"Now his failure is complete."  -- Darth Vader
I don't have any objections to a different voice actor taking over.  At some point, they'll have to retire Vader simply because they're going to run out of story.  (And I just read that it wasn't Jones which makes me a little sad.)  
Which is a bad take on their part.  We witnessed Obi-Wan lose almost everything and we see the kind of live he's been living for the better part of a decade.  His character progression make sense and the story as a whole is new and interesting.  I think they made a lot of mistakes with the new trilogy, but personally I would have liked to have seen Luke an an elder statesman type role like Yoda and Ben from the original trilogy.  
I don't quite get this either.  But haters gonna hate.  
I rememeber the glut as well.  The stuff being produced today is heads and shoulders above what we got in the 1990s.