The persistence that Pellers has shown in wanting to play two in midfield this season means there is a high chance he will do the same next season.
We pretty much played with a variation of 451 all season (4141, 4231, 4321... etc).
I think you are making up a 'persistence' to play 442 to be honest. We used that formation in just 9 Prem games out of the 38. Hardly persistent.
And even breaking down those nine games you have a real mixture of success. Wilshere and Noble played together when Bournemouth overran us early in the season.
Noble and Rice were at the heart of it as we went on a run that saw us win at Newcastle then at home to Cardiff and Palace before beating Fulham... We then tried the same tactics at home to a half decent Watford side and came up well short so we swiftly reverted to 451 and won at Southampton.
We also tried to play with a 442 away at Burnley which was a disaster of a performance all round, away at Wolves (same again) and at home to Everton (same again - although that was with Rice and Obiang in there).
The only conclusion you can really bring from all of that is that 442 only works against the really weak sides in the league, and whenever it has worked for us, it has been Rice and Noble in the middle.
The point I (along with various others) am trying to make is that we just cannot play with two in the middle against anyone of any quality. Hardly any other teams at this level play that way and make it work.
We would need far more than just one decent 'shiny new CM' to make 442 work for us. We'd need to be a lot more solid at the back, we'd need forwards who pressed from the front and we'd need wingers who knew how to tuck in to make a compact four in the centre when we lose the ball. Even then there would be some games that you just wouldn't be able to get away with it in.
It isn't simply a case of upgrade Noble = progress as a club. Which is the point you to to be making.