The reason bimota failed was development, they wanted to use semy direct injection like skeedoo but they had 6 month's or so development. I cant use there injection method, because at idle (800 rpm) i calculated that the injector only has 0.83ms to inject the required fuel and that is not enough time for a low pressure system (3.5bar) to inject the fuel.
The advantages of port fuel injection is as follows
better atomisation at any throttle opening
larger throttle body without sacrificing low down torque
The reason manufactures do not develop 2t efi is simple, what are the modern 2strokes known for:
3-low price compared to equivalent 4stroke
Those are the selling points.
For a pure mx bike i would not develop this. on a mx track the disadvantages outweigh the advantages.little altitude change, wide open throttle most of the time and short races compared to enduros.