My guess is that it's not cancelled forever but more than they're out of the ability to pay for staff to prepare for something they don't know when they'll get to do next. I mean what do you need a sales staff for when there's no event. What do you need logistics people for when there's no logic (ok, don't go there, I'm kidding). But I bet someone still owns all of the IP associated with the brand and if the world ever unfucks itself sufficiently there'll be a new RMAF.
Related aside - i can't imagine how many industries/events were and are still hanging on to the hope that they will be able to do their thing this year and get back to a position of doing things and making money. How many promotion, production, catering, event rental businesses etc. have gone under or are on the brink? [/rant]