Is that the collective fandom deathwish represented by harping constantly on the regeneration limit has now been legitimized. The premise of Doctor Who is infinitely extensible; the only thing that can end it is the viewers not wanting it to continue, and that’s what the regeneration limit has always represented. By explicitly giving the Doctor a new cycle as opposed to saying the limit is gone forever, the series has embedded the limit even more strongly into the series’ DNA. That the Doctor will eventually run out of regenerations and die permanently is now inevitable. It might be in 2060 with the 23rd Doctor or 3015 with the 405th, but it is unavoidable now.