I've been following the playtest and like what I see so far.
That said, one of the biggest issues I've had trying to sell RM in the past is the large number of books. Is there any chance for a single volume that encapsulates RMU up to 10th level like the old RM:FRP did for RMSS? Spell lists only to 10th level, a selection of lower powered critters, simple treasures, possibly an intro adventure as the last chapter? Keep the rules exactly the same, just put in a smaller amount of "stuff" to keep it to about 250 pages.
I might actually have better luck at getting some people interested if they didn't feel they "had" to buy Character Law, Arms Law & Spell Law just to get started. The "Chartmaster" reputation is hard enough to overcome. (I had that come up simply on mentioning the playtest - "Oh, Chartmaster still exists?")