I hear so many people saying what a wonderful thing the gig economy is -- how much freedom they have, how much they love not working a traditional job, etc. All of that may be true, but just wait until all the traditional jobs go away and most people are forced into squeezing out a tiny living doing things like driving for Uber. I highly doubt everyone would be super-happy at that point.
The relative economic stability of the last century was driven by consumers consuming, buying stuff, paying taxes, etc. and that was driven by those consumers having a stable paycheck or other source of income to fall back on. When that gets kicked away in the name of disruption, society needs to have a better answer than "oh, we'll figure something out later." I've been lucky to have stable work, but I know that I cut back on spending when I think something might be afoot at work. I can't imagine never knowing whether I'm going to have a good or bad week coming up.
I think a lot of the gig economy cheerleaders are mistakenly thinking that Uber drivers are in the same league as, say, a flavor-of-the-moment software or IT contractor making $200+ an hour. I know a lot of people like this, who do nothing but travel around the country and get paid obscene amounts of money to implement the new hotness at random businesses. It's not super-stable, but they make enough to survive bad times. Uber drivers are barely breaking even, especially if they're financing their own vehicle purchases, etc. Like them or not, their business model is exploitative at best. Driving a cab is often the last resort job for people.