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I love the idea for a number of reasons.
1. It is something new in a ME game and can work with the Andromeda story, since there are no returning characters and won't break any canons.
2. Also, more palatable to new and old players.
3. Gives everyone a chance to play a different combat role in one single game (though less powerful).
4. Experience the various skill sets and can then settle on the right one on a re-play.
5. Easily introduces the concept of selecting and playing your MP character in the SP game.
This can easily be seen as an improved ME game. It has all the elements of one...familiar races, cinematic story telling, weapons, armours, biotics, MP play, bonding with squad mates, the Mako, a ship (Pathfinder is the name?) and romance options....
I see no pitfalls, with the idea. The purists can stick with their oiginal character, with their virginity untouched..