I would expect the W=A and the Hilton will join up with Wyndham Bonnet Creek, who contracts with Maingate Transportation. They have departures roughly every half hour each morning but to "shared destinations"---there is one bus to MK+EP, and one bus to AK+DS, every half hour on the half hour and quarter hour respecitvely, each morning.
Bonnet Creek is better than most offsite locations save the DTD Area, and it would work in a pinch, but I'd still want to have a rental car. You have to pay to get to and from the airport, and after that the additional cost of a car is pretty modest.
Also, the location is so central to WDW that cabs might be an inexpensive option if, say, you want to split up one day, etc