You're giving a LOT more credit to reforging than it deserves. I mean it's nice and all, very nice, but you're still giving up a stat for only 1/2 of another stat. It's not a panacea, it's a good think tool as far as your itemization goes.
Also the topic is about weapons, the reason I mentioned and use 2-handers in my example is because that's the boat we're in right now. In Cat they should do as you say, although I think a lot of the polearms will still end up around 3.4 speed or so because DK tanks may want a good survivability weapon with dodge and armor on it.
However we will have Shaman and Rogues looking at the 1-hander pool and if something has a high damage range with a slow speed then that's going to be the first thing looked at by Shaman, Rogue, DK or Warrior when considering if the weapon is an upgrade or not. The AP gain through Str/Agi will definitely determine what weapon is BiS, but from just an upgrade perspective you want the one that's going to hit like a mac truck.