What's nice about that camera is that it will be good for even longer than a few decades to come if nothing otherwise falls apart. It will be good until you fin

What's nice about that camera is that it will be good for even longer than a few decades to come if nothing otherwise falls apart. It will be good until you find the image quality unacceptable. Considering the image quality is already high enough to not be any limiting factor in most cases, I doubt you'd ever be hurting for an upgrade ever. The lenses too are unlikely to improve dramatically in the future. Lens designs at this point are 100 years old already because the laws of physics are sort of firm on what is possible. Autofocus motors are already plenty fast enough to capture a sprinting cheetah. Once you are bought in, there's no point to upgrade because if anything it will be to spend thousands for marginal gains. Only worth it to pros who can spend thousands on gear a year as operating expenses for business where they bring in factors more with that equipment.