What I think will be the make-or-break factor is if the SR-15 as configured reaches the dealer shelves at the nominal 60-80% of the Ruger catalog MSRP.
If that package is around $1200 (as the Obama panic fades), because it leverages Ruger's purchasing power for the third-party parts, and their MASSIVE distribution chain, that will be a game-changer in the AR market.