I am. The level 60 squish is proof that they were blinded by the quick flash of classic success and want to recoup that for the next xpac. Even if it is only people resubbing for 1 month like with classic.
100% the exact same thing happened to me. A bunch of people resubbed and were gone by level 20. When I logged in ~2 weeks ago there was no one in the guild who had logged in for weeks. When I made a new druid there was only one other person in Mulgore.