KDB will be playing at this level, for 2-3-4 years without any doubt..
Since last season, Pep doesn't use him as a box2box midfielder, he is more of a second striker / number 10 or whatever Messi played during World Cup..
That's why Bernardo or Gundo play more nearer to Rodri, than KDB.. And that's why we signed Phillips, cause for just rotating with Rodri, club wouldn't have payed 60m.. Maybe there is a plan, that we will see Rodri - Phillips duo in midfield (especially when both Bernardo and Gundo can be sold at the end of this season..) and KDB will play upfront, focusing more on goals and assists and less about defense and build-ups.. Basically our formation is 4-2-4 now..
So in that system, you can rotate KDB with a lots of players.. For example young Julian can play second striker and team-up with Haaland.. Or you can play Grealish as a number 10 and check how he does there, maybe he is better number 10 than a left winger (and we all know, that's the truth :D).. Foden can play everywhere, so as long as KDB is rotated, he may play less games, but quality will be there for sure..
I think our transfer strategy and new formation / system is based on club's wish or goal - to use KDB as long as it's possible and shape our team so, that even though he will decline with the age, we still could use his phenomenal attacking skills.
Like for example whole Argentina team was shaped during this World Cup and recent years, so that Messi could still be used and played..