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I think "buggy whips" come to mind . . . . I can't imagine the majority of sport flyers continuing to fuss with glow engines for many more years.  Kinda like 72 Mhz radios, nobody wanted to switch to 2.4 until they saw how life was without pulling a frequency pin . . .
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Not a business guy, but I'd imagine that getting into the battery market first would be a better move - that is the "expendable" part of the power train that needs regular replacement and can produce future sales through improvements (Nano, anyone?).  The motor and ESC are pretty much one-time purchases.
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Then again, maybe YS can figure out how to put a supercharger on an outrunner. . .
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