If anything, the options I would put are:
1- Restart the Lineart thread, everything works the same way, except now it is an activity. (Of course you can still post your colored stuff for critique in the pixel art board)
2- Only Lineart thread. (Post the lines you colored in either the pixel art board for critique, or the OT creativity thread for just showing off)
I wouldn't go with 2 threads. Why? Because, if we are doing that, we might aswell just have one, as it is right now, having the first post updated as linearts come up.
Though we could set up both lineart thread, and colored lineart thread as many of you want. BUT you will have to work your asses off, and start coloring linearts like demons, otherwise it goes down.
(And if I see someone simply filling lineart with the paintbucket and posting that, it will automatically go down)
[edit]:Oh and sure, I'll gather all the lineart.