I don't even think it's likely to be catastrophic at all.
Edit to add:
Everyone is pulling these random P(doom) numbers out of their asses. This is likely going to be amazing for everyone, we'll cure basically every disease, fix the environment, and go travel to space if we can get out of our own way enough to do it. I cannot believe the consistent negativity I see about this.
But it's never "good outcomes aren't guaranteed" it's always "DOOOOOOOM!!!" and other cynical bs. Things aren't as dire as people are making it out to be. This reminds me of Malthusianism that never panned out because low and behold we figured out ways to solve the DOOOOOM problem before it became catastrophic.
One person saying “this might be catastrophic” and then another saying “ahem, nay sir. It is only likely to be 99.99999% of a catastrophe.”