We do have Bernardo Silva who has all talent to be as good as Iniesta. And we'll bring in more press-resistant players next year (DM like Weigl, new DLP if Gundogan is affected by injuries too much and KdB doesn't work well there). The idea of midfield Pep is implementing at City is roughly the same as at Barca - there's no way round it if you want to have a dominant possession team.
Real Madrid is using the same concept now. Cruyff showed the way 30 years ago, Pep and Spain proved that he was right.
All the talk about 'enforcers' in midfield is strange, it's 2017, not 1997. Of course some height and muscles are required, but the idea is defending by team effort and pressing, closing passing lanes and setting traps. One more defensive specialist (say, Kante) in midfield would disrupt passing game/ball control and put his team under pressure, thus causing more damage than advantage.
Or, maybe I didn't get you right? What's your proposition?