I hope it does well as i do think the FFG produce good stuff and they deserve success, but it does seem like a lot of people are looking for rules that'll let them use the armies they already have.
The big strike against Runewars will be that it's the first attempt at such a game that isn't aimed squarely at people with big WFB armies and begging them to use the minis they have with whatever new rules people are cooking up.
I've seen a lot of people jumping on Dragon Rampant because of that. If FFG have some means of allowing people to use the minis they already have, it'd be very persuasive.