I have been making a mod for a long time, and really thought I could get it out before NV, but it appears I will not be able to easily. So I have one simple question. When NV comes out, will you still continue to download mods for FO3 and play it, or will you probably barely ever play it again?
I haven't decided when or if I am going to be getting New Vegas, but if I get it, I will likely go with the new and updated engine. I might go back for a MQ overhaul or similar large scale quest mod - or even to try out a group of quest mods. There are a few large mods in progress that I look forward to seeing completed.
Depending on what you are doing, it may be possible to convert it to the New Vegas engine. I know Miax is working/hoping on the ability to do so. You may be able to spar on it?
I will not touch NV before my Enclave MQ mod is complete. Whether it takes a week or ten years.
From what I have read, your Enclave MQ mod is pretty much tied into the setting and story of Fallout 3, so it would make little sense trying to convert it to using New Vegas engine and resources. Besides, it would be a quest mod of a scope that would get people (like me) to reinstall Fallout 3 again.
Not to mention (for both of you), just because New Vegas is comming out, it does not follow that no one is going to be buy and/or play Fallout 3 anymore. Morrowind came out in 2002 and it is still being modded and played. Same thing with Oblivion.