Bad idea. How do they decide who stays and who goes when it comes to clones? The 'best' game? The first game?
All the console makers have been deciding what can be made for their systems for a long time. I'm sure the process can be quite arbitrary and unfair, but at the very least, it reflects some effort to have a curated library of games.
Personally, I'd prefer to see App Stores that had a much more curated experience (for all categories, not just games) than a "swap meet" type of experience, but that's just me. These days I find the App Stores incredibly painful to use due to the amount of duplicate junk in their inventories.
I find most of my mobile downloads and purchases these days come from recommendations by sites I trust.
Consoles have traditionally had a large barrier to entry. You couldn't just buy a MacBook and a $99 developer account and make NES or PlayStation games. Having an SDK that costs $25,000 in combination with an approval process to even consider you eligible to buy it is a big filter.