EDIT:
Orlybus will officially close on March 3rd, due to pax numbers being down 80% with the opening of Line 14 to Orly. With Orlyval being aligned on global airport pricing and the availability of RER B from Denfert, access to Orly should remain quick enough even though the bus was practical.
Source
Also, Orlyval is now included in the global 13€ airport ticket to/from Orly (and CDG) but can only be loaded on Navigo Easy cards (or phones). Orlyval will not work with Liberté+ or any weekly/monthly passes.