So far I've haven't read anything that expressly prohibits someone from NOT developing a RLV intended to be used after winning the prize, merely that it must be privately funded/built:

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Requiring that the vehicle be privately funded and privately constructed means that a large government cannot come in and win the competition in a manner which does not lead to economically viable tourist capability.

We chose 100km altitude because it is beyond the official 50-miles that the US Air Force recognizes as "worthy of astronaut wings" but not so high that the reentry speed requires exotic heat shielding.

Requiring a vehicle which can fly three people means that X PRIZE registrants will be designing vehicles which can turn around after the competition and begin to generate revenue traffic following their certification.

Finally, requiring that the same vehicle fly twice within two weeks means that cost per reflight is only the cost of fuel and the limited "touch-labor" that can be applied in this short period of time. Therefore, we hope that cost per seat will be reasonable and affordable to many.

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Anyway, what would it take tecnologywise to realize my previous scenario?