Indeed, some of the top fighters in their respective classes can always show great fights, but apart from the best fighters with main card fights, none of them look great, there are several other events that the UFC can actually take advantage of to have several new fighters.
But so far they have made efforts to select fighters who are worthy of getting place on contract with the UFC, some time ago there were even several fighters from Asia who tried to get into the UFC but I don't know how it went because I didn't follow it.
Presence of new fighters will create much hotter sensation, especially if they are great new fighters and are able to show success in every fight.
I think maybe Dana is thinking about this too but on the other hand he won't give out contracts and bring in fighters he doesn't think are worthy, Dana will always take the best to be here.