It wasn't actually automated. A fraction of it was automated. You had to book a technician in advance (within specified hours) who would come out, it cost $50, and you had to come back later and pick up your old pack. And then there was the overhead time issue, which made it not all that much faster than supercharging in practice.
Tesla simply gave up on it. Nobody wanted it, even if it hadn't been so expensive and inconvenient. Nobody wants someone's old battery pack, and Tesla doesn't want to be stockpiling huge inventories of expensive pieces of tech which is a constantly moving target and which doesn't match up (and never will) between different models with different energy, power, shape, and pricing requirements. And this is just scratching the surface. Each time you're doing it you're taking out a huge, integral structural component with a lot of sensitive connections. What that would do for vehicle longevity / reliability in the long term.... well, I guess we'll never get to find out, but that's probably for the best.
Beyond that - do you see anything that might suggest swapping in the permit? I sure don't.