Not all Buddhas were assumed to be born to ksatriya families, anyway. One need only read the Mahapadana-sutta and anything else, really, on the topic in the canon. The princely story is the favorite, but allowance was made of birth to brahmins as well. But I find this thread much more revealing of modern sensibilities than of classical Buddhist ones. Yes, the story is of birth to kings or well-to-do brahmins - it is also of rejecting the elitist drama and taking up the path that is casteless and genderless. Gautama went so far as to open his samgha to women and affirmed that they became arhats as well, a sentiment which is taken for granted in today's society. I suppose if we were to update the story to modern times, then, Buddhas would be born to media moguls or multi-national corporate CEOs. The effect is the same - being born into what ordinary society thinks is the ideal life and abandoning it for something spiritually revolutionary.
"I practiced without a teacher,
My aim but one, with no equal.
I amassed one practice to become a Buddha
And naturally penetrated the noble Path."