"It's tough to make a forecast, especially about the future."
-- Yogi Berra (presumably)
I have no forecast. The one I started to post met the delete key. I deleted it not because I thought it was wrong, but because I hope it is wrong.
Certain things seem more likely than others, though. I think Martin Rees is a bit of an optimist. Eric Pianka is probably right. Albert Bartlett is probably right.
Time will tell. Que sera sera.