Food production is already absurdly automated. At least for grains, in theory you don't even need humans to drive the tractors on the fields any more, drones and RTK GPS systems automate all of it from seed to harvest. Cattle is fed and milked fully automated as well, with precise tracking of how much each cow ate and how much milk it yielded. Chicken also don't need much human work to lay eggs.
Most societies up to industrialization had a primary (i.e. agricultural) sector of around 50-70% of employees (numbers vary). Today, it's more like 1-2%, and the number is bound to fall - especially when lab-grown meat really takes off, because slaughtering and butchering farm animals _at the moment_ cannot be done by robots at scale and IMHO it's more likely that lab-grown meat succeeds before we entrust sharp knives to robots to actually kill animals.
> Who will fix our cars?
Modern cars - particularly electric cars - are much less maintenance intensive. That's part of why many established car brands are in serious trouble with their historically grown dealerships... "life long oil fills" and general improvements in technology already cut back on a lot of income from repair and maintenance of dealerships, and electric cars have far fewer failure points (other than crappy software) than ICE cars. We simply won't need anywhere close to the current number of service points, and we also won't need gas stations with trucks that fill up their tanks as the cars will be charged through the existing grid.
> Who will fix our potholes?
I 'member a story of some bloke holding up a sign like "I filled the potholes, pay me instead of your taxes". Local politics is on a downward slope across the Western world (with a common factor being the central government depriving local governments of revenue or loading off expenses to local levels), I think we're going to see a lot more of such incidents.
In any case, the price of trades labor will have to increase to be an effective incentive. And if you ask me, better pay the tradespeople than the vampires and vultures of Wall Street. At least the tradespeople do something to keep this society alive, the banksters do not.