Yes and no. It was not planned that Betts would catch up and overtake the class above him.
What will happen is there will be a few of the young stars who will stay (although ALL OF THEM STAYING is an option the Red Sox have that other teams don't) - and other guys who leave or get dealt. There will be other good players staffed via trade, maybe a big FA. And then maybe it's somebody in the organization like a Travis - or maybe it's fishing for more fungible big league assets who usually don't cost much money (middle of the road corner bats, defensive infielders).
Really the title team lineups were the stars we all know backed up by meh veterans on short hitches like Mike Carp, Eric Hinske, Daniel Nava. The trickier thing is finding those guys consistently. There are enough of those journeymen around in any given year for a team like the Red Sox to fill in gaps. (a team like Tampa on the other hand is better off giving it to a kiddo - assuming they have a lot of gaps)