It has been mentioned by merchandise CMs that plastic bags will still be available on request in the Parks, and of course, they'll still use the bags to ship to resorts. Whether or not, however, they'll eliminate the bags later on down the line is a moot point, but I seriously doubt they'd phase them out anytime soon, but then it does lead to the question of how purchases will be shipped, not to mention practicality, especially since not everyone is willing to lug around a heap of reusable bags all day, because it's difficult to anticipate what you're going to buy, and the largest reusable bag they're selling in the Parks doesn't always fold nicely into some bags/backpacks/totes/handbags. That said, it does make me wonder if they'll explore using plant-based bioplastic bags to replace the plastic ones, because again, there's going to be people that find carrying around empty reusables to be rather impractical and challenging.
The term 'environmentally-friendly' is often thrown around too much, and yields dubious practices that appear to look good to the greenies, yet is tantamount to greenwashing. 90% of the time, they're not often backed up with an ecolabel and/or other certification such as ISO 14000, and often smells of bottom-lining. With their solar farm often praised, Disney could easily use that to power their dishwashers and also use soap that's also truly environmentally-friendly, backed up with proof, of course.