I have to say that this would improve ratings, and its not as much as having them all on the same station, but rather having the shows on stations that most viewers get.
The sci-fi network for example, I have to pay an extra fifteen bucks a month to get a package that includes the sci-fi network, just so i can watch an hour of wrestling. lets say that ECW was on the USA network in the same Tuesday time slot, The ratings would double, and for no other reason that ECW would be available to a wider audience.
I would have to assume that Vince is making a little extra money, having three contracts with three stations, as opposed to 1 contract with one station.
If I had to pick a station to do it, I would give it to USA, they seem to do a pretty good job at advertising RAW throughout the week, as well as cross advertising with there own network shows.
* WWE has their own On-Demand T.V station, where you can watch all types of classic matches, and such. Now what if it was an actual station, they have more than enough programming to put a legit tv station together, a good selection of WWE D movies, classic wcw programs, old ppvs, they have the rights to it all, and its only a matter of time in my opinion before the next step is taken. (and even with this station, they could still have a contract so simulcast raw, or smackdown on the usa network.?)