Hey I've got a question. Do the devs make note of our favourite mods and consider implementing things they did in future titles. Like the nVamp mod.

I say yes.
Skyrim supposedly took note of Oblivions bow mod; the one that increased DAM but reduced ROF.

Just the first example that comes to mind.

It's very obvious that many New Vegas' new features were based on Fallout 3 mods: hardcoe mode, thirst hunger and sleep, weapon kits, ammo weight, multi-stage enemies (for example, baby deathclaw, deathclaw, deathclaw alpha and so on..) along with many others.

However I strongly assume that New Vegas mods will go largely unnoticed. The next Fallout game is possibly years away and will likely use another engine, and may be developed by a whole lot different bunch that worked on F3/NV.

Well chances are it will use the same new engine skyrim uses, but I'm guessing people will still look at mods for various features.

They probally do, and they have probally taken some, but there aren't any really memerable ones to use in the game I've seen (I have it on xbox, can only see mods on videos).