I don't see the difference between delivering groceries and delivering luggage. Bell Services are Bell Services...it would be the same as driving to the resort with a large group and having bell services tote the luggage from your car up the stairs (at OKW) to your room. You'd tip them, but the resort wouldn't charge you a fee. Or, if you arrive with groceries in your car, and have them take them from the car to your room, I doubt they'd charge you a fee.
And assuming we all pay for Bell Services base salary through our dues, why isn't DVC exempt? Are they going to start charging us a "check-in fee" for taking up the front desk CMs time next?
Soon, it will be cheaper to rent a car for a day or uber, go have a nice meal offsite (costing Disney money), and go to Publix to pick-up your own groceries.
I think Bell Services may see far fewer tips, as people will assume this charge replaces tipping.