That's very hard to say without quantifying "likely" and "considerable". One could say the same about most extinction events, for certain definitions of those two words.
I find mood affiliation to be a much more convincing explanation than convoluted definitions of "not likely" and "considerable".
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.