Prior to the start of the regular season, we really only had Alex Smith and Colin Kaepernick as our QBs. People weren't really expecting much from these two. Alex Smith was pretty much considered a bust and only a stop-gap solution at QB. Colin Kaepernick was considered an immensely talented athlete, but would need another 2 years for him to be NFL-ready.
Then we signed Scott Tolzien, who looked pretty good in the game we had against the Chargers... but still... he's another rookie.
Now... 14 weeks into the season, things suddenly look very bright. People are already speculating on re-signing Alex Smith. He's had a very good season, and the thought of a full off-season with Harbaugh/Roman has got to make 49er fans feel very good about next season. Colin Kaepernick looked good in the Buccaneers game and is continuing to develop. He's been able to get some reps in this season, so I'm sure that's helping. Haven't heard anything from Tolzien, but I imagine he's progressing along as well.
It's just a huge contrast from the beginning of the season, when we thought we were in real trouble at this position. Sure, there's still a lot of big questions to answer. Like... "can Alex Smith succeed in the playoffs?" or "How quickly can Kaepernick develop?" etc. etc. But for the first time in awhile... I don't really worry about who we have at QB. (It's the offensive line I worry about now)