Not necessarily. The FM3 only has one amp. block and similar processing. Not saying the FM3 isn't a great product, there seems to be some great features the AX8 doesn't have. However, the AX8 is still a great portable unit and it works great as an effects processor in front of an amp. Not to mention, great sounding amp. modelling as well...maybe not Ares great, but still great.
Ax8 will continue to be a great product, no doubt about that, but, if you can get similar power, newer modeling, a huge color screen, much improved controls, USB audio interface etc, for just $999 brand new, I think it will be hard for folks asking $1299 or so for the aX8 on the used market like they previously had gone for when out of stock. Probably going to be quite a few hitting the market too which will saturate things, time will tell though