When I made the switch the only problem I had was going back to AVID. The damn thing is CLUNKY. I have the decklink card at home and at the office, and Have no trouble getting a digibeta deck to work. The 10bit uncompressed is less compressed that 1:1. I would see if you can get one FCP rig then import an Avid Edl (I hear this is possible) although I haven’t done it myself.
I have not had a problem with the timeline at any length. I only had improved edit experiences. Imagine not having to select segment mode, or trim mode, its always on. Just pick up a piece of video and move it around…its really cool. As far as the 720X486480 I can tell you that as long as you have the right card and the full non express version of FCP you can edit in 486. I’d be happy to discuss the change with you in more detail as this seems like a ranting and unorganized post from me.
Cheers