Well, as someone mentioned, removing trinket procs and other gear-related procs from bleed snap-shotting does remove a massive amount of the math and combinations you'd need to require. That being said, I think Blizz would make a few assumptions that make it less prone to "zomg I need an add-on to track this!"
First assumption is that SR will be up all the time. I know, sounds like a no-brainer, but it allows bleeds to snap-shot the SR buff and still not need to track the bleed strength with respect to SR. If the level 100 talents remain the same, offering passive SR, that's one less thing to track.
Second assumption is that we'll use DoC procs on bleeds. I'm a bit leary of this assumption, though, especially if we don't know how abilities in WoD will scale. However, if Rip/Rake are supposed to be the prime candidates for DoC when refreshing them, you can snap-shot DoC w/o having to track bleed strength with respect to DoC. Again, DoC is optional, so it's very likely the average Feral may not take it because it requires a bit more effort.
At this point, the only variable in bleed strength would be Tiger's Fury. One thing isn't too hard to track, especially if bleeds get the Pandemic treatment. Considering the length of our bleeds (especially Rake), it won't really be too difficult or maybe necessary for the average player to even worry about SR/DoC/TF effects on bleeds, as long as they use them with good uptimes.