I think it can get to a point where there isn't as much needed work because of tool/technology. As for working for our own satisfaction, there is only so many people that can do one thing before that thing is no longer valuable. If a billion people start making pots, there won't be any money in pottery, so you won't be able to afford to live. I don't believe there is actually "unlimited" trades out there. Are there really new app ideas, sure. Most of them aren't needed though, so they wouldn't make any money.

I think we will start to see half the population falling deeply into poverty and suicide rates climbing drastically if we don't find ways to spread wealth more evenly. The poor will want to revolt to force it, the rich will want to start wars so they can keep their wealth by culling the population down so the tiny percent of wealth they don't hold can hold the impoverished over enough to make them not want to revolt.