There were several bubble/low-rated shows this season that ended up getting renewed when typically we would expect the networks to have just cancelled them. Here are my thoughts on why they survived and you can also see my thoughts on this season's cancelled shows at this link.
Prospects for Sixth Season: None. FOX is letting this come back for thirteen episodes to wrap up its story and then they're almost certainly going to go back to low-cost reality shows to fill up the schedule for Friday nights from there on out.
Prospects for Third Season: Not good. Even if some tweaking does help improve the quality of the series, the show's move to Friday nights is less than promising. FOX has been trying to prop up a Friday block of genre shows for a while with the likes of Dollhouse, Terminator: The Sarah Connor Chronicles, and then Fringe the last two seasons, but with little success. Now they are pairing Touch with Fringe, but the latter series already has one foot out of the door as it prepares to end its run. In all likelihood, Touch will exit with that one as well.
Prospects for Fourth Season: Excellent. The guys over at TV by the Numbers believe that most studios won't renew a series for a third season unless they are pretty much certain they plan on giving it a fourth as well. That brings it to 88 episodes and the current magic number for syndication. So it looks like, despite its poor ratings domestically, Nikita will be around for at least a couple more years.
Prospects for Third Season: A toss up. If NBC continues to struggle and Grimm doesn't drop off too much, then they will probably keep the show alive. But then the ratings for most shows decline in their second season, and Grimm doesn't have a lot of breathing room, especially considering the slippage it saw in its numbers toward season end. Still, I would give it a better chance of surviving than FOX's Touch.