We, as fans, deserve NOTHING more than what Bethesda is OBLIGATED to do for us. And do you know what they are OBLIGATED to do after you have bought Skyrim? Nothing.
depending on the contracts signed with sony and ms, they in fact, are obligated to support skyrim. for how long is unknown. not to mention todd's own words, saying they are dedicated to making skyrim the best running game (for beth) and that they are committed to eliminating all the bugs (i certainly don't believe todd, but no one forced him to make those outrageous statements; promises are self imposed obligations. who did he promise something to? the fans).
and considering there will be another xbox exclusive dlc, they are obligated to produce it.
so yes, beth does have obligations.
also, just ask this simple question: 'if beth was not obligated to make patches, would beth make patches?'