I think if you have to ask that question the answer is: probably not.

I'm pretty much in the same boat as iopq... started playing online last summer, got past the micros in november and build up my BR over 10k, and I can't say with a lot of certainty that I can sustain 1k+ per month... although I probably can.

But to your question: I've sustained 10bb/100 hands over more than 100k hands at 25c/50c and 50c/$1. playing an average of 8 tables - usually more lately. So I expect to make ~$22 per hour @ 50NL and $44 @ 100NL. But that can vary between $100/h and $-10/h over the course of a month - depending on volume, how good I run, how good the games are, how well I'm playing on average and so on.
I haven't been on the very low end of variance so far, but a loosing month is definitely not impossible.