Though much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven, that which we are, we are,
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
--Lord Alfred Tennyson--
Great job then! And we've had more than what we bargained for, we're to have Wonder Woman BEFORE Justice League!
That only means Steve and Etta might be dead by the time of her sequel. The Amazons? They're immortal. They'll still be around. And Diana can always acquire a new supporting cast in the modern age. That Kapatellises? Cassie? Donna? Trevor Barnes? Plenty of other options for a supporting cast.
And that's assuming that Steve doesn't somehow become immortal, or spend a century on Paradise Island, or get resurrected by one god or another by the modern age.
There is nothing going on that precludes Diana getting a sequel.
Though much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven, that which we are, we are,
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
--Lord Alfred Tennyson--
There's also the fact that losing part of her supporting cast in a film series with a finite narrative isn't that big of a deal. The lack of a stable supporting cast with the likes of Steve and Etta (among others) floating in and out of the book, or getting rebooted away before being brought back in, etc. has always been a major weakness of the property. But films are a different beast, and hopefully Patty Jenkins will retain creative control for the possible film series so the transitions between casts and settings are smoother than anything we get in the comics.
Though much is taken, much abides; and though
We are not now that strength which in old days
Moved earth and heaven, that which we are, we are,
One equal temper of heroic hearts,
Made weak by time and fate, but strong in will
To strive, to seek, to find, and not to yield.
--Lord Alfred Tennyson--