I haven't kept up with who else is in this draft, but he'd be smart to stick around if he's not a lottery pick. He might be better than Westbrook in the end, but he hasn't shown nearly as much at this point, even in flashes of potential. At least Westbrook took a few games over during his last season. I don't know that Holiday has shown a grand total of 40 minutes of excellence in his career to date.
I'd be kind of surprised if there was a high lottery team that had the patience to develop him. It's clear he won't have the instant impact that other kids will have.