Terraforming is possible, scientifically. It’s the logistics and brute force needed that makes it hard - we need so much more atmosphere than what’s there.
We know there’s water but not how much. We also need more CO2 to make enough oxygen.
I do think someday, maybe 300 years from now, it will be done.
We would also need to find a means of setting up a massive magnetic field around the planet.