I got your point! It might be interesting but not to decide a World Champion! This is what I think: Magnus said that he wanted to give a chance to other players to become world champion, but that is precisely the problem, because to be the world champion is not a matter of chances, it is a matter of merits, talent, mind and capacity!
Magnus himself got there (the title in 2013) by a very difficult path, I accept it is very tough to got the chance to be the candidate. Nevertheless, he managed to do it because he is the best and that is what was missing in Chess since Gary Kasparov left FIDE in 1993, we did not have the best player as the world champion!
Now be got him and he is the best without any doubt. Additionaly, Magnus has just defended the title once or let´s say it has just played it twice and both against Anand, so I do not understand why he is "tired", I think he has to wait and beat guys like Caruana, Aronian (not the next time) or Nakamura to say it is enough and "boring" or to be tired, since them, specially Caruana would be extremely difficult for Magnus in a match and I guess he would be World Champion some day.
With all the respect the players deserved, I just hope not to have another Khalifman or Kasimdzhanov (even Anand or Topalov, however their situation is sligthy different) as a world champion, because I agree with Kasparov, they are just "tourists" and they became World Champion because of the weak format! The problem is that it was Kasparov himself who gave them the possibility to become World Champions leaving FIDE with that cisma that I do not want to experience ever again!