If they raise resort prices, then when a discount comes out, the overall price goes down. If they tack on a "resort fee", that price is exempt from the discount. And like taxes, that resort fee will never go down but will most likely increase as time goes on.
There's also the issue that Disney has been cutting back on resort amenities while increasing rates faster than inflation rises. DME was promoted as a free service, EMH was a perk for staying onsite. If Disney institutes a resort fee, then what exactly are you getting for the outrageous hotel rates, besides proximity to the parks?
And finally, let's address the perceived money grab by Disney. Yes, I know that they are a business and as such, they can charge whatever the market will bear. The bean counters have created more "seasons" so that they can increase room rates. They raised the cost on weekends. They just raised the cost of the dining plans on the heels of a massive ticket price hike. It gives the consumer a feeling that they are being nibbled to death by ducks.
And then it raises the question: How do you police the parking, wi-fi and resort "entertainment" so that it is exclusive to the guests who are paying a fee to enjoy them? They can't even get guests who aren't entitled to be there to leave the parks during evening EMH! Are they going to scan MBs in the lobby of the GF so that only those who paid to be there can listen to the live music? Will they meander among the people enjoying an evening beach movie to verify that they are staying at the resort? They can't even police their pools to make sure that only guests who are staying there are using them. How about those who want to dine at the resort or just check out the resort- do they pay for parking if they arrive by car?
And the question was posed about DVC owners. We pay dues every year that maintain the wi-fi infrastructure, transportation and parking lots in our home resort. Will we also be asked to pay the "resort fee" when staying on points?
There are a whole lot of reasons to bristle at the idea of instituting a resort fee. It comes across as just another way for the Mouse to suck the cash from your wallet while not doing a damn thing to offer you anything more for the money.