“Does that include the righteous?”
The righteous are no longer under the curse since Jesus came under the curse and bore the judgment for us. However, we labor in the results of the curse but not under it.
Rom. 8:22-23, “For we know that the whole creation groaneth and travaileth in pain together until now. And not only they, but ourselves also, which have the firstfruits of the Spirit, even we ourselves groan within ourselves, waiting for the adoption, to wit, the redemption of our body.”
So "the earth and all creation" are not presently under the curse.
The number of Christians is growing world-wide, so I don't see any trend downward. As more and more people become Christian, will that have any positive effect on the creation?
But you said “all creation is under the curse”. Aren’t the righteous part of creation?