The Gipf games have had some two decades now, and quite competitive online scenes for some of the games. They've been played enough to know they aren't broken or trivially human-solvable (Zèrtz on the smallest board option probably is but like most of the Gipf games, it's very naturally extendable to a larger board.) Dvonn and Gipf had strong bots for them even in the pre-MCTS age, but that's not really a problem. None of the Gipf games are drawish.

Whether they become "timeless classics" and get a stream of discoveries or not I think is mostly down to chance. It's more about what we let them be in our lives than their inherent qualities.