It's not been interesting for a while. There may be > 10 cars, but there's very few that actually make it to a win, and there's been only one that's mattered each year for almost a decade.
The question I guess is how much less exciting would the race be if it was only the 4 cars that might win racing compared to today where there are those 4 cars + 14 others.
It's already dead. Might as well have the testing.