Well from what i heard you dont have to destroy the RC even if you release your DC and kill the Window… Just make sure the DC/Window has the same size as before when calling wglMakeCurrent(). And i also would suggest that you call wglMakeCurrent( NULL, NULL) before releasing the DC etc.
Personally i think its pretty stupid to have to destroy the RC when alt-tabbing out, because after that you have to reload all resources which were associated with your RC (textures, DL’s…). Mostly it doesnt matter that much (in my apps at least), but if you kind of got something like q3, you have to reload anything (like restarting the level) i’d guess…