...the a/c was at that point most likely still heading 028T (046M) and should structural damage have resulted in the break-up of the a/c, debris would normally be found in an arc +/- 30 degrees of the final heading ...
For what it's worth, I've been watching the ship tracker site, and there was a cluster of ships that lingered around the equator at 30W. That is where the news reports have said debris was found, and it is to the right and back of the flight path projected by your suggestion.
Ship locations
If they have in fact found debris at that location, then the aircraft would have diverted from its projected course.