You're just being silly. Many games without shops or subscriptions get supported, develop new content and are maintained for years, decades even after the release date, with no additional form of income.
That's common practice.
As for Classic, i'm expecting a solo sub at an inferior price (5$~) or having it included in the regular subscription which would have players check the 'other side' when things get boring for them. Also a reason for people on retail\live\current version to check Classic during content draughts, and keep them interested until the next patch\expansion. Keep them in circles