The so-called gig economy will cease to exist in 20 years, according to a new report from venture-backed start-up Thumbtack, an online marketplace that helps skilled workers find customers.

The study predicts that logistics companies — from start-ups like Uber to tech giants like Amazon — will soon replace drivers and delivery workers with autonomous vehicles and drones. Highly skilled workers, such as lawyers and accountants — no longer guaranteed jobs at big firms — will be the new gig economy workers, the study finds.