for my understand if with 100 validators is not decentralized, why is going to be decentralized with 150 validators?
the first step is to do some like Harmony, change the code first, then open more slots for newcomers can compete in fair terms, if now open the doors to 150, then is going to be more centralized and tomorrow or someday when the code change for cape the figure of the king validator is going to be more difficult for newcomers for what cosmos is doing now. IMO no have to explain more because is easy to understand.