Here's the kicker - any new industry, at any point in the future, that pops up demanding labor, is much more likely to invest (since they are investing anyway - it is new industry and new markets) in automating the labor out of the equation from the start. Industries are only slow in that transition today because they have established infrastructure around the usage of meat bags on two legs as units of work, but for anything brand new (like semiconductor plants, or the Tesla auto factory) even in the short term it makes more sense to automated the expletive out of any physical work because I'd imagine in even just a year at minimum wage it would pay for itself factoring in the fact you have to build everything up from scratch.
So the solar panel installer in 10 years would probably be a self-driving fork lift truck that carries a bed of industry-standard packed and oriented solar panels, where the vehicle has GPS and will drive to all customer homes and install the panels automatically, with only the need for an electrician to come wire them into the houses electric.
But that is short term. You can easily replace the electrician with some hand held spider robot that will use the blueprints for the house and sensors to find and rewire the electrical into the panel. In a hundred years, you aren't installing new panels, because every new house is factory made (by automated assembly) with the panels preinstalled, and they all have interchangeable parts quality electric systems that dumb non-sensing robots can rewire because they are standardized if necessary.
It is glorious that we are eliminating the need for human capital to make things happen. We are removing people from so many equations you would otherwise be wasting someones time on. We may have some bumps in the road and some dark ages of depravity and extremely concentrated ownership of the means of production and all that, but a thousand years out (assuming we haven't destroyed ourselves yet) any human still alive (albeit with a nebulous definition of human if we start gene splicing and installing cybernetics pervasively) will almost certainly have no need to "labor" at all, because the machines and infrastructure built up over a thousand years will provide for them.