AS Claire says, there were never any wine glasses in the studios (or at least not recently), just drinking glasses. This is the official line:
As part of a continuous review of cleaning practices in Disney Resort hotels, leaders determined that hand washing dishware and glassware in Disney Vacation Club studio units wasn't sufficient to meet the company's cleanliness standards.
For studio accommodations at Disney Vacation Club Resorts in which glass-washing equipment is available (Disney's Beach Club Villas, Disney's BoardWalk Villas, The Villas at Disney's Wilderness Lodge, Disney's Animal Kingdom Villas and the Inn rooms at Disney's Vero Beach Resort), glassware and ceramic mugs now are cleaned in the glass washers, rather than by hand.
Studio accommodations at stand-alone Disney Vacation Club Resorts (Disney's Old Key West Resort, Disney's Hilton Head Island Resort, the villas at Disney's Vero Beach Resort and Disney's Saratoga Springs Resort & Spa) now utilize disposable cups, since glass washers aren't available at those resorts. The company wanted to take action quickly, and using disposables was the most expedient solution. Housekeepers replenish the disposable cups upon request.
Disney Vacation Club leaders are investigating more environmentally friendly disposable products, as well as the possibility of installing glass washers at specified locations within the stand-alone properties.
According to reports around the time of the announcements, it is possible to request mugs and glasses once you've checked in.