I'm not Mike but I also have the XC and to be honest it's the end game HP for me. I've had the HD800, TH600, heard the TH900, LCD-2, LCD-X and many others and I can honestly say the XC is the sound I was hoping. It is my reference HP and I've started EQing other HPs to sound similar to them to remove the upper-bass and lower-mid muddiness that tends to plague most headphones.
That said, I have a very good feeling they (EL-8 closed) will be tuned similarly to the XC and will sound incredible. If you look at Audeze's past you can always walk away knowing that even if you didn't particularly care for the sound they sounded amazing and it's a matter of finding one that you like the most not whether or not you like them to begin with. I can say that I'm personally not worried about the EL-8 being a bad headphone and disappointing.
If the closed EL-8 does manage to be cleaner and lighter sounding like the XC vs the X then I'd be more than happy. If they manage to maintain more of the Audeze house sound I'll be happy as well.
Yes, Audeze will likely put out a revision relatively quickly but I don't see anyone having a problem with that when it comes down to it. If you're going to say they made a mistake by making their product better then maybe we need to reevaluate our hobby.
To be honest even the LCD-2 both fazor and non-fazor have a very good resell value even still.