after we get Sandro and Isco they will laugh harder...
In short term that won't help us significantly.
I understand the project. In theory, getting lots of the best young players in the world (Morata, Pogba, Dybala, Berardi, a young AM like Isco/Oscar/Goetze, etc) is a formula for future success. Yeah, you sacrifice a year, two or three until these players hit the mid 20's and (hopefully) develop into world's best players, but later you have a team that can rule Europe for half a decade.
But in our case I'm pessimistic. We're not yet a club that is financially powerful enough to keep these players once they turn into superstars. That's why I question the project and that's why I'm skeptical that this complete transformation will eventually result with something even better than the current team.