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See one thing you have to take in mind was during the "Monday Night Wars", RAW was on TNN, WCW on TNT. TNT comes with pretty much every cable package, etc. TNN does not. WCW had an advantage there. Same thing with TNA. They are on Spike TV (formerly TNN). If they do try to rival RAW by bringing a show to Monday, then to be direct competition they would have to switch to a different channel.
Raw was on USA Network originally hence the reason for the homecoming in 2005 hence them saying "RAW is returning home". RAW moved to TNN fall of 2000.