It's possible for a number of things to be true at once:
1) we're likely to avoid 4 degrees and end up at 2.5 on our current path. That's very good! 4 degrees would be extremely bad.
2) 2.5 degrees is very bad
3) We're not doomed to 2.5 degrees. It's possible, pretty much at any time soon, for us to politically decide that we should be under 1.5 degrees.
4) The COP process has pretty much done as much damage as it has helped.