That's life. People can be unhappy, but I am sure Disney already factored that into their decision, which is hardly unique, even in the hobby industry. Did Bandai want, or would be able to afford worldwide rights to StarWars model kits? Even if they did have the money, would they have the resources to do it?
If this is such a hot item (Star Wars plastic model kits), why is no one else falling over themselves to grab these licenses? Two reasons, likely related closely - the license probably costs a lot, and the return from plastic models is likely insignificant to make it worthwhile in parts of the world. Bandai probably has far more assets than Revell or Round 2. I can see the North American model companies deciding that expensive licensed properties are not worth it. Remember Monogram getting burned by Star Trek:Voyager?
Be angry at Disney. I bet they have a lot of well paid people in suits that said regional licensing is the way to make money. Compared to a small number of disgruntled modelers. Be angry at the companies that haven't gone after a deal in other regions.
It's not ideal for every possible consumer, but remember, it is about making money. If the deal makes Disney lots of money, and upsets a few people, they will be fine with that. And Bandai probably is too, as they don't have to produce more and have a bigger distribution network. Making it available to everyone everywhere does not automatically mean sales will increase to the point it is worthwhile.
It would be a magical happy place if everyone could sell everything everywhere and make a profit. But it doesn't work that way. And before anyone accuses me of being a Disney/big business shill, I have been hurt by these things, too. Maybe the #2 animated franchise after Gundam is Macross. Because of Harmony Gold and their involvement with Robotech, none of the successor to the original Macross series have been available legally in North America. HG says they have the rights here; the Japanese companies say they don't, and won't release the material here because of that. It sucks, but it's the way it is.
99.999% of Star Wars fans will be satisfied by the entire aisle of pre made plastic junk that will be in your Walmart soon, if not already. That tiny fraction looking for a multi part, unassembled, unpainted model kit will not even be noticed by Disney. It's tough to hear your favorite hobby is insignificant, but it is reality.