Yes, great idea. Can't they propagate more trees from cuttings? They should plant all the seeds as quickly as possible. Every single one. Time is not on their side so action is required. If they want seeds for a museum they can get them off new trees. Seeds belong in botanical gardens anyway ..
There are experts in agriculture, and these experts will know how to make viable places for growing these trees. It will take dedication and a commitment to growing the trees in an environment where they can't be hurt by other plants or things that might infest the trees. They will restore these trees and they will find a new way to thrive in the world.
If scientists have access to other seeds they can use this to create plants that have died out. I do not know if this is neccesarily a good idea, because some plants should not be brought back. I don't think this technique while help them bring back animals but there are other techniques that can.
Technology will actually allow us to restore other extinct plants and also animals. This is evidenced as scientists were able to grow an extinct tree from an ancient jar of seeds in 2013. Research has enable the scientists to come up with a way to do such amazing things and therefore kudos! to them.