Earlier quoted context omitted.
No niche manufacturer will be able to make a competitive V10 PU. If F1 is serious about reducing costs, they have to at least standardize PU, like they did to ECU.
Engines is the least of concerns. Mercedes win, not because they also produce the engine, but because they pour nearly half a billion euros into the car, with engines being a vanishingly small amount of that. They have a car with superior aerodynamics and mechanical grip. Making the engine standardized will not change that.
It takes more than just throwing money at the problem to win. Otherwise, Red Bull (paying for two teams in full) and Ferrari would be doing a lot better right now.