From a greedy player perspective... yeah i hope they do. Far as a rational thinking player... no i dont think it would be a good thing to do. Sort of torn really. For the most part all the reps i would have wanted BoA(aside from pandaria) were just to get mounts, so little point in that now. Also the way reps work with some places would make life a major pain in the ass. For example i have bloodsail admiral on just one of my toons and never grinded back that rep. So that one toon can not go to booty bay without serious issues... if they made rep BoA so that it was the same no matter the toon i used... then what? does that one toon go back to rev/exalted with booty bay? do the rest of my toons get booted from booty bay?
This is just one of the issues with this idea. Now a form of giving rep, or rep gains to alts that might be ok. With MoP i care little about the reps, have no need for the gear and simply some day want to get the mounts to add to my collection. I think they need more then the 5.1 change to make MoP reps less hated as it stands right now. Not sure what, but its just not enough. I have tillers working on my main, however i would LOVE to be able to farm up the motes on my not yet 90 alt for BS recipes... oh look i have to do that rep all over again if i want to do that... no thanks. Over all seems this expansion has shunned alts all together aside from the account wide mounts/pets n stuff. With the new rep VP system, and crafting materials that can be wasted on your main you play a lot, and needed on an alt you only have for a profession and dont want to actually play.