Does it really matter if it takes a century to materialize? You're not really that egocentric that you're willing to screw your children and grandchildren for the comfort of driving a SUV today, are you?
Yes. If it takes so long that our descendants can engineer their bodies by then, they might be glad we pulled out all the stops to allow them the chance to exist. Tolerating some pollution may enable some fantastic technological developments. Whether or not it's worth it is not my place to say.