Personally, I think its high time this series showed us the formative events that created the Federation.
Here's an Idea: Start season 4 with Archer and company trying to stabilize hostilities between the Vulcans and Andorians. Give it a two hour season pilot so we can see the hostilities in full swing end it with a very fragile and tentative cease fire.
Go back to the story about mid season for one or two episodes for the purposes of checking in on the situation and solidifying the cease fire into a truce and possibly full peace accord.
The final episode of the season could be the initial proposal of a "Federation" to make sure the peace is kept. Of course there will still be obvious friction all around and certainly those who would try to sabotage the whole proccess, but we could start season five with the Federation as an actual working body.
The rest of the season could be fleshed out with stories that can be told in one hour.
I realized that after TOS, Voyager is my favorite Star Trek series for the simple reason that it was simple. The stories were complex enough to keep attention and be enjoyable, but simple enough to usually be taken care of begining to end in the one hour time spot. Stories from both TOS and Voyager weren't so bogged down and convoluted with subplots that you were lost iof you missed even one episode.
If the goal was being faithful to the spirit and intentions of TOS, then Voyager is where Berman and Bragga did it best and came closest to living up to the Star Trek legend.
Its time for them to move on now and let new blood take the production helm, I don't think they're hungry enough anymore to make the new series what it needs to be.