Things seem to be improving in Libya, if you count having Gaddafi's forces having less territory being an improvement. This seems to be playing out a bit like Afghanistan a decade ago, where a combination of US-led air power and anti-government troops on the ground pushed back the Taliban.
The two differences from that experiences are (1) there were some special forces on the ground to give specialized support and (2) a Northern Alliance grouping of anti-Taliban folks were already running part of the country and gave the US someone organized to work with.
Is there a fear that al Qaeda will fill this vacuum? Yes, but it shouldn't stop folks from getting rid of Gaddafi, who isn't exactly the good cop of the area. Does Lockerbee come to mind? If not, look that up and weigh that against 9/11. He had been on a peace offensive in the 00s, trying to look like just another Arab Big Man, but that's now well out the window.
The al Qaeda line reminds me a bit of the tarring of the civil rights movement of the 50s and 60s with a communist brush, since the US commies were backing it. In that case, the help of the hard left was secondary to the cause and the commies were actually on the side of the angels. I think the same is true here in Libya; al Qaeda help is tertiary and they're actually fighting for the good guys in this one.
The potential fear to deal with down the line is if al Qaeda tries to carve out fiefdoms in the more secluded parts of the country, especially in the desert south, turning southern Libya into a staging area much like NW Pakistan. However, we need to deal with that down-the-line.
This is a messy undertaking and the president is going to get some flak; he gets it from the left since he isn't a pure pacifist and doesn't keep the other 535 secretaries of state happy with constant briefings, and he gets it from the right who nit-picks for the sake of nit-picking.
I made the mistake of surfing into Hannity on Friday; he questioned whether Obama's up to the job in Iraq. The US is, and one can only hope Obama is as well. It beats the heck out of assuming Obama isn't up to it, in which case the best we can hope for is a slaughter of innocents and a few guilty ones. He might not be my first choice, but he's the POTUS for another two years; unlike Canada, we don't have the option of having a new election when we "need" one.