I really hope BW focuses on continuing the DA-saga without going MMO, especially since SW:ToR will take a lot of time if they plan to keep that world alive and evolving.
Personally I don't like MMO's due to the fact that they exclude gamers like me, with 2 kids and a full time job. I can't spend 2-3 hours straight doing a dungeon with a party, or a raid? No way. MMORPG-questing with me in the party would be the ultimate nightmare for anyone else in the party...
Also after trying WoW and FFXI for a bunch of years back I came to the conclusion that MMO's are too grind heavy for me. Even on an RP server on WoW there was a lot of 1337-people focusing on the next purple reward etc. That plus the fact you never really feel like you do any difference in the game world took away the immersion IMO. (just like Lord_Darkmoon pointed out)
So if BW decided to do a DA-MMORPG, that would most surely put the focus from other DA games (just like SW:ToR probably is the main reason KOTOR III probably never will come out, just like WoW probably is the main reason there's still not a Warcraft 4).
...I'm still dreaming of BW making Star Wars KOTOR III, though with ToR, I know the chances are thinner than slim, hell, guess the chances are probably even anorexic. Nuff ranting.