The only universal constant is Change.

LFR is the big experiment here. If people see these numbers and think "I can get half my weekly VP income from just doing LFR?" It'll push a lot of people into LFR. Depending on the mindset of the people going into LFR, it may go over like a lead balloon -- noob players punished for not understanding mechanics, elitist players manipulating the vote-to-kick system... there's certainly the chance the community will eat itself when such a high number of precious VPs are at stake.

Of course, it may all be a mistake to have the VPs only be awarded for completing LFR instead of per-boss. I suppose that puts them in line with Heroic-5s (you only get the VP award for killing the endboss) but with the possibility that the playerbase will grow more hostile, it may not be workable.

They could decide that 25 is too many to coordinate for randoms. We could see another large shift in the raiding paradigm with MoP, and that will change how LFR functions, which in turn changes how the Valor/Justice system functions.

The most important thing here is that Blizzard will never stop iterating on the system in order to improve the accessibility and challenge of the endgame. When they stop doing that, we know that the game is over.