How To Guarantee A Hit TV Show

I've been thinking a bit about this new as-yet untitled Beverly Hills, 90210 spin-off show that is set to debut on The CW this Fall and while I'm excited that we, the viewing audience, will be able to return to the hallowed halls of West Beverly High, I'm really worried about the casting. I totally get that it makes sense to cast a bunch of relative unknowns (after all, how many of the original