The flip side is that after 2010, Republicans wont be dealing with a political environment anywhere near as freindly as 2009. I expect a big backlash against Christie and Republicans by 2011.
The most important factor in who wins what will almost assuredly be redistricting. There's not an awful lot of room for Democrats to eat away at seats under the current map anyway -- Republicans only have 2 vulnerable state senate seats [SD-07 (if Diane Allen retires, which I presume she will) and SD-14 (which will be decided in a 2010 special election)]. In the Assembly, there's only one Republican vulnerable to defeat (AD-04), though more could be winnable with retirements (like 2xAD-02).