Let's say we could kick it down the road 50 years--I don't believe a mini-Ice Age is coming either, and even if it is NASA for one expects it to counteract only around seven years of carbon emissions. So this is all a bunch of pointless hypotheticals. But bear with me.

50 years from now, assuming around 2% annual global growth (a conservative guess), the world will be over two and a half times richer than it is now. We'll have had 50 years of technological advancement. Given that right now the biggest roadblocks to dealing with climate change are (a) the very real costs of mitigation and (b) the lack of technological ability to cost effectively generate carbon-free energy and remove CO2 from the atmosphere, there's a decent case on the face of it that we'd be more able to deal with it, notwithstanding the couple hundred extra ppm of CO2 we'd have to worry about.

Part of my motivation is also that I'm increasingly pessimistic about us getting our shit in order in the present day. The current radically corporatist administration in the USA gives only lip service to the problem, and the opposition... well, the less said about the opposition, the better. So if the hand we're dealt is that we have to deal with climate change in the present, we're pretty much fucked. Kicking it down the road would at least offer some hope.