Not just yet. For right now we just need to really dig into the CO OP MP experience and make it the best offering in the entire industry. Which based on ME3 I think Bioware can easily achieve. Once this is mastered then yes we can start moving in that direction.
MP is the future. It where the money is. Look at the most popular and profitable games. It is logical from a business standpoint as well. Most importantly their ME:A is unique in its style and would also stand out among the pack.
They will only end up with another dead franchise on their hands, just like with SW:TOR.
And there's probably more MP shooters out there that failed, than ones that really succeeded. Even those that had "great potential".
In any case, for me a franchise that moves into the MP-only area, simply stops being relevant.
(and that's not for lack of trying on my side to put up with the BS that comes with MP)
And luckily, because I'm not the only one that thinks this way, it will probably take quite a while even if you are right.