If the efficiency of processors has doubled or even tripled in the past 4 years, maybe that would be enough to handle 8k video recording, but there is a severe shortage of processors going on right now. I've been wanting to build a new desktop computer for the past year, for example. But there is no new APU from AMD, and even the "current" 3400G APU is out of stock now. And of course discrete GPUs are ridiculously expensive so that's not an option either, so I cannot build a new computer right now. Newer and more capable cameras might have to be held back for similar reasons.