> It would be a reasonable thing to attempt with today’s technology, but it would be a serious R&D project.
Dinosaurs have enough cultural prestige that it would make total sense to do it as a vanity project if the technology is there.
Similar to turning lead into gold -- there's enough cultural meaning built up around it that someone should do it before it really makes sense in a vacuum.
It’s harder the older the sample and vastly more difficult if few closely related species survive.