"Would they even have revived the same show again without him as the draw?"
Hard to separate the two... it was conceived as a package deal all along. Originally, Natasha was going to reprise her role, too. So, it was always about revisiting this production of this show - with this set, this director, this choreography, this staging, and this star.
So, while I agree that they wouldn't have done it, it seems odd to pull one element out and make that the only reason they did it. I certainly wanted to see this entire show again and I adore Alan, so it makes sense. But with Natasha no longer with us, it does make it a bit of the Alan show now.
Now t/d/b/a haterobics on here.