I suppose Frundtech would be an already existing Idea, then theres that Outlands thing.
Personally I think that if we went for Frundtech it would die a very quick death, and the Outlands server might run the risk of being one sided due to the lore of HL2.
I propose a long time of nothing and then when everyone's ready bring create WW4 or 2 or maybe even just another WW3 for the sake of nostalgia.
But don't take my word, I'm just a twat who wonders about the server/forum jumping into shite.
Like this thread for example!