well, that's not correct.
Indeed, there are many 737NGs (-600/-700/800/900) on the market, with another coming soon.
But there isn't ANY 737-200 in payware quality, neither for FS9 nor for FSX and only one classic 737 (-300/-400/-500)
There are big differences between the 737 generations, so I do not think, that CS would make a mistake by doing a 737.

But I would agree, that it would be a mistake, if they were doing another NG.

Captain Lawrence The 737-200 is a long awaited project,we've been crying in silence for a knight in shining Armour to come up with this great project and Captainsim,first in the Air as usual have done what no publisher has ever dreamt of,they've carved a niche for themselves,personally I insist they get a special award from every 737-200 operator globally.I for one would humbly plead that FS9 user do not get left out of this great experience,I don't think FSX users should be the sole beneficiaries of this project.
I wish captain all the best on this project.

Long live Captainsim.