A post from Blizzard announces the Recruit-A-Friend program for World of Warcraft is soon going "on hiatus" (thanks Ant. This will go into the shop for an overhaul in about a month, so in the meantime they urge players to turn up the heat on those who have resisted entering the MMORPG for 15 years now:

Recruit-A-Friend (RAF) is heading into the workshop! The longstanding RAF program is going on hiatus while we construct something new that makes it even more rewarding to introduce your friends to World of Warcraft. As of June 11, 2019, the current program will come to an end, and you’ll no longer be able to send new RAF invitations. Don’t worry though—the program will be back in its new form before you know it.

To take advantage of the current RAF program, your friend will need to link a qualifying WoW account to yours before June 11, and will have 90 days to purchase game time to trigger any rewards.* Check out the RAF web page for the details on the current program and the available rewards.

We look forward to sharing the details of the new RAF program with you in the future!