so if one could maintain a consistent temperature across the exhaust system, would that minimize the effects of air flow fluctuation due to the changes in exhaust pipe temperature?
i agree that if you can make more power with a carb system over an fi and keep the reduce complexity of the fuel system that fi would not be so impressive.

side note or way out in "left field"
ive contemplated if you could somehow combine the reed and throttle system in to a single operating unit and use a fuel injector or multiple injectors to directly inject pre mix into the crankcase, similar to the idea of direct injection on automobiles. would this allow a designer more freedom to play with port design rather than to fall into the constraints of using the same combination of carb to reeds to crankcase to cylinder...
 
feel free to elaborate motorgeek

Keeping the exhaust temperature inside the pipe from one end of the expansion chamber to the other constant and repeatable throughout the whole length, would help the repeat ability of the air consumption and fuel demands.

I do not think that there would be much of an advantage of injecting fuel into the crank case over a well tuned carb. 

Suzuki has had doing R&D on some variable lift-variable duration cam engines for about 5 to 7 years but has not been released for production.  These engines do not have a throttle on the intake.  All of the air flow into the engine is controlled by the variable lift /duration cams.  At an idle there is very little lift on the valves and very little duration.  At high RPM and max power mode the valve lift and duration of valve opening is more radical than a conventional cam setup.