I think that now that they've tinkered with the idea, even if they renege on it temporarily - it's inevitable that they keep on using it. Every time there is a bad decision now, commentators will say "I'm sure if they could have referred that to the 3rd umpire, they would have made the right decision", and when a team sees it as having cost them the game, then they'll kick up a stink about it too.
The other side of the coin is that umpires don't want to "do a Rudi" and fire someone out when replays show that they probably weren't out. This means that, as happened a fair bit with the introduction of the 3rd umpire for run-outs, there will be far too much referred to the video man, and thus far too much time occupied through the deliberation of decisions. In addition, often with just basic replays, it is just guess work for the video umpire, and while it may be a more educated guess, chances are they will still be wrong at various stages.
I personally hope that they get rid of it, and add a cyclops type mechanism for no-balls to help the umpires concentrate solely on decisions.