-1
Unlike the person people above me, I'm going to tell you why SCP cannot work in this current state of Gmod. (Tood gave a pretty good reason from a development standpoint, that is it would be a waste of time and resources)
Currently, SCP is dominated by other servers, they're not even serious Rps they're semi-serious at best.
The demand for a serious SCP RP server is not high right now. The reason SCP was so popular was because of youtube and the light it brought on SCP such as Markiplier and such.
While I would love V1-V2 SCP back (Unlike the guy above me's absolutely shallow reason with no base cause Halo RP is just as bad they've had characters like that also) SCP would be as Tood said a waste of time. There is no solid player base for it, and the genera itself is kinda dying because of the Drama that happened with the actual Wiki, and the current servers that dominate it easily take up a lot of potential player base, that are in the end a player base of minges.
Maybe if Gmod itself changed, SCP became popular again and the bigger mingey servers died down for a more serious rp route I could see it seriously coming back but that is very unlikely or will never happen.
But considering this is denied already take this -1 as more of an explanation of why SCP will not come back unless major changes happen.