Steve does bring up a good point about the lens requirements. But theres alot more to consider as well when looking at the increase in sensors in these 50megapixel and up range.
Interesting article here..
https://photographylife.com/are-you-...-50-mp-cameras
Other considerations are post processing time,file processing and storage, computer processor speeds and needs, viewing etc all are affected. You may need to upgrade much besides the camera! It also sounds like your picture taking technique itself may need to be modified..ex hand held may become more challenging.
I do have to wonder though at what point is it overkill ? Unless you are selling your work,doing it as a living or want to be able to use a single pic to wallpaper your house...how many hobbyists will ever benefit from a 50 mp camera? From what I have seen the majority of hobbyist ,even semi pros post most of their work on line...which means its what its being viewed on that is the limiting factor...not the camera sensor itself...
Its actually kind of funny and ironic.In the early days of digital.Film captured far more detail but digital advocates would say that did not matter as most people had begun viewing the images digitally and so the limiting factors were monitor resolution, scanner resolution and printer resolution..Films ability exceeded all these in native form...but not when digitized. Now as digital starts to exceed film...the industry seems to forget...those same constraints exist..sure monitors and printers have gotten better as have computers...but how many people have the high end version of these?
My take home message here for forum members reading this is know your goals,your target audience and your budget.It can be a very costly hobby if you try and keep up with the latest and greatest gear...the results can be very worthwhile but only if you take the time to learn the basics,practice much and are independently wealthy!
Al