Yes and that is how things evolve, look I'm just throwing an idea out there and I'm more happy to see turbo engines coming back, but the rules are getting cut more and more each year and teams are complaining. Now teams are much to blaim cause the attribute innovation to cheating. Double Decker Diffuser...that must surely not be fair, it was fair for a season but the FIA ruled it out for next season. Also these are big manufactures that spend millions on engine development in the first place for their road cars to begin with so doing so for a sport to gain trickle down effects and possibly other customers (small teams) isn't going to hurt them. The small teams would only have to do what they do now, and that is find a engine provider (cosworth, pure, etc.)
It's not an impossibility and it is also plausible to make it happen, what makes things worse is when innovation is made and the regs cut down on it next season, then teams must work that much harder and spend money a bit much more just so they can figure out a way to be fast or just as fast as the season prior, much less faster.
I see where you're coming from and I agree, but you and I both know that certain teams would welcome such a open regulation, especially seeing that teams have experience with this (at least all engine providers that is) and probably would still go the simplest of routes because of what history shows.