Is humanity doomed

The thing that gives me some hope for humanities future is that we are geared more than anything else to survive and create the best living conditions possible. 

Generally in human history, often with some lag time, we have done what would or has achieved this goal best. When we were hunter and gatherer type people this skewed towards looking out for the tribe ahead of the individual because we had not yet conquered the earth and most could not survive well for even brief periods without the tribe. With the industrial revolution, innovation, and conquering the earth it swung towards emphasizing personal responsibility and rewards.

Now that we have conquered the earth and are wearing out/depleting the earth, not to mention found ways to quickly be able to obliterate ourselves, we are going to have to again shift towards a more collective approach to survive and create the best living conditions possible.

In a lot of ways WW1 and WW2 were probably the start of realizing this. And some changes were made in the aftermath as you have often mentioned. If you look at some of FDRs ideas of what would be needed to form a better society that did not require so much big and small conflict, there was also this understanding politically, at least from some. However, as the new great power in the world it was still in the US’s short term (say 50 years or less) interest to use that power primarily for its own prosperity rather than a global prosperity that might be more stable.

A similar dynamic was occurring at the individual level in the US. For those individuals who had a moderate amount of comfort and prosperity, they were more likely to keep that and increase it a little in the short term (here maybe 5-10 years) by focusing mostly on their own self interests, especially if they could mask that under ideologies and jargon that made it seem best for the whole of society.

However, as mentioned to start, we are quickly approaching a time when surviving and having an improving way of life is simply not going to be possible without a radical change in the way we view things and operate. Up to this point in time someone trying to prematurely start this better way of life has been marginalized in various ways. Soon though it will be the only way to do what we are most geared towards doing, and thus we might actually do it on a large scale.