That's something that Lucid will have to figure out, and the company, as well as the general concept of OTA updates for automobiles, is generally new. Tesla has been doing it longer, and their general philosophy is to support even the oldest vehicles in the fleet, but as cars get older, there's a lower likelihood of getting new features, especially if they rely on newer hardware. In Tesla's case, it's been possible to upgrade the MCU and get new features. I did that primarily because mine was failing and it took too long for Tesla to address the general problem, but had I not, I wouldn't have had whatever my older hardware couldn't support.
A big difference between Tesla and Lucid is that Tesla's is a more closed system. Eventually, there's less likelihood of new features or bug fixes being needed for older cars, and it becomes like traditional cars where you are stuck at a certain level. Since features such as Android Auto or Carplay are or will be supported by Lucid, there are external factors, and there might be a possible need to upgrade to support newer features, be compatible with newer smartphones, or anything else that the future might throw at it that's beyond Lucid's control but not beyond their ability to keep up with.
Time will tell, and I can't see Lucid failing to react if people find that their new phones aren't compatible with their cars in five years. But it's harder to say what will happen decades from now.
