Those fortunate ones with enough wealth to have the option to just watch Netflix for a year and don't do much else, don't do that and are happy with it. And neither would the less fortunate once after an initial learning phase. Humans must learn to be free, but they can. We want to take part, show our contribution, feel proud. As soon as we have found a pleasant way to contribute, we do.
Yes, conditionless basic income would change work ethics. People who fill up supermarkets displays or serve food to unfriendly customers at unhealthy hours would maybe just stop going to work. I would be happy for them, and I hope it would happen today.
There is a lot of work that is needlessly tiring, badly paid, and in which you are badly treated, but people just stay in the status quo because they see no way out. Once there is a way out, the jobs will have to change, and that rapidly. That would be progress for society I still hope to see in my lifetime.