Good news for those of us who like our unsustainable tropical hardwood furniture: it looks like there's going to be a lot more of it to go around soon enough.
Self-generating and unmanaged rainforests would take fifty to eighty years to produce trees large enough to be harvested. Even if we managed these hypothesised new areas to cultivate hardwoods, you're still looking at forty or more years. No offence, Tim, but I don't think that is "soon enough" for you to benefit from a new teak loveseat.
And realistically, neither option is particularly likely given that the regimes who control most of the potential new forestry shown on that map are the same regimes who are currently replacing their rainforests with unsustainable arable land. Why would they suddenly change tack and sit on their hands for half a century to let new rainforests grow?