Firor's other games may not have been huge successes, but lets keep in mind he was trying to make online games before the internet was really considered a 'big deal.' DAOC was one of the first few MMO's and it was way ahead of it's time. Maybe too much, to be honest.
I've played DAOC, was a lot of fun and the RvR was, back in the day, a game-changer to be sure for the Everquest formula. However, it was not massively successful. That's not to say it wasn't good, not at all. Most MMOs I like are less successful than DAOC, ha!
I agree a lot of the concepts were ahead of their time, but execution-wise they weren't all there, similar in many ways to SWG. Now perhaps Matt Firor has a chance to make a DAOC-like game that he always dreamed of. Sadly, that means another, far more popular franchise is being sacrificed to do so.
I'm not discounting his ability completely, but I'm also thinking he was not at the very top of their list of available MMO designers. Top ten, sure, but not the first approach.
Another worry I have was that, since DAOC was such a fluke on his resume and everything else was pretty much licensed garbage, DAOC must have been his passion project, his "baby" so-to-speak, just like a game I'm working on (that will remain nameless) is to me. This can go two undesirable ways; he is trying to recreate the success of his baby and therefore sacrificing any and all TES elements to do that OR he is jaded from his first outing and has lost the real passion and drive to innovate, instead creating a rote rehashing of his previous success because it's the only thing he's ever done that even mildly worked.
When he was quoted as saying "if you want Skyrim, go play Skyrim" this was indicative not of passion, but of resentment for the TES audience trying to get in his way somehow and a blatant lack of understanding of what that audience would want out of a TES MMO by and large. That was a VERY worrying reaction.