It will take time for the new jobs to appear and people to be retrained, just as it did during those past instances of great change. Meanwhile people will be unemployed.
Yes, they will. Do you have a proposal for how to simultaneously provide for efficient progress and smooth transitions? I mostly see people either lamenting the suffering that big changes often cause, or brushing it aside as inevitable. It'd be interesting to see ideas for how we could have disruptive developments without so much disruption.