There is a solution to this, and ironically, Blizzard has had it in place in the Diablo series for years. Just make a main, non-seasonal "Eternal Realm" progression mode alongside the seasonal characters. I have a feeling Chief Rebel might make this concession in the future, but it might not be before my friends and I are long gone.

The MLB has “The World Series.” Professional Golf has “The Masters.” And the NFL has “The Super Bowl.” But why "Bowl"? And why "Super"? The origin of the name is a lot more complicated—and accidental—than the corporate sheen of the event suggests.