i still havent played brotherhood, or revelations so this could be totally out of whack, but the templars could have been reduced to their knees by the ezio, and the assassins guild in europe, which is why they were trying to build a new powerbase in usa where the assassins arent already a powerful force keeping them under control. it would explain why they are the underdog, why they wanted to be in america and why, in desmonds time they are powerful in usa, but not nobility but business - they wanted to do it in a new way in the usa - it's harder to take down a web of business than a family. i definitely think it could work, though we know it's not how they're doing it so i guess it's moot.