You keep saying this, but I think you know that the plan IS for the Sox's highly-touted farm system to turn out a core of elite talent comparable to Houston's. If all goes according to plan, Eloy, Moncada, Robert, Madrigal, etc. will be comparable to the young cores of Houston and other successful rebuilds. That's the whole idea.
Now, nobody yet knows for sure if that will happen since they are still just touted prospects and not established MLB stars (just like Altuve, Correa, Springer, and Bregman a few years ago). You don't have to believe it. Maybe the baseball world was wrong about Moncada and Eloy. But the Sox have built a top farm system with projected star power, which is all you can really ask at this stage of a rebuild . Your issue really seems to be with the talent the rebuild has assembled (and the projections for that talent), not the rebuild process. And if you just think that the talent in the Sox system is no good, we're pretty much sunk and free agent signings aren't going to save us.