As much as the replacement refs haven't been exactly great, I don't see where they have blown any more calls per games than the regular refs. it's a shame we won't get to see them go through a bunch of regular season games.
I think with time the league would do well to replace some of the current refs with a bunch of these guys. I don't think the best of the replacement lot have been has been nearly as bad as Salvatore, Mauer, Palmer, Rush, the Crawfords, or Kennedy have been over recent years.