I would agree that new smallmouth fisheries aren't necessarily a bad thing. The bad thing is that global warming doesn't end in 50 years. Instead it goes on and on until the climate stabilizes again, IF it ever does and who knows when and where that point is. Those new smallie streams could become catfish and carp habitat or just simply dry up and blow away if the climate becomes too hot and dry in that part of the world. I don't know if this will happen. It's just that humanity has never been down this path before and I think we should try to take the longest view we can.