When in history has being idle not been a problem?
If AI and robots are able to do all the jobs, being idle isn't the negative it has always been.
All through history, you needed lots of non-idle people to do all the work that needed to be done. This is a new situation we are coming upon.
If they are doing all the jobs, who is going to receive economic opportunities? Will we no longer be able to participate in the economy?
In what way do you want to participate when there's no economic value in any of it? Just do whatever you want for yourself; you're free.