Is it not the case that like a VC, a seed-stage investor maximizes his income when the startup he funds tries to hit a home-run? And are not home-runs much more likely if a VC invests in the startup?
Home-runs are more likely if VCs invest, but it is hard to say whether this is because VCs select the companies most likely to be big successes, or because their participation makes companies big successes. So it is very hard to predict what would happen if startups stopped taking VC.