The big issue is that you need to replace the forests, not just the trees. The habitats that can support redwoods have dwindled, and just replanting the trees won’t be enough. Even if you want to restore previously harvested areas, there are co-evolved relationships with various symbiotic fungi and bacteria that are necessary for these trees’ survival - if the fungi and bacteria they rely on aren’t there, then they will not move water and nutrients as efficiently, and will not be as resistant to drought and other climate extremes that are increasingly likely. This is to say nothing about having the right mother trees - saplings usually spend decades in the shade of their parent trees, awaiting a gap in the canopy. They grow slowly during this time, but if they survive they are also more hardy and better placed to grow dominant when the canopy eventually opens up.
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