61MP! Just think of the size of the hard drive!!!
Best picture I've seen was from the Sony VB770, now discontniued. I'm guessing the price was too high for most. That used a full frame 35mm. TBH, when you look at the Sony, I ee no use for anything larger in physical size, assuming yoiu can achieve the performance at a high enough shutter.
Hopefully, some of these 35mm sensors might filter their way down to CCTV. I know Panasonic has several good low light photographic cameras. I have heard a rumour that Sony keeps the best sensors for it's own camers though. Lets hope it eventually repurposes the senosr from the VB770 to cctv sensor sales. I'd guess they probably need to find another use for it as it's probably unlikley they recovered their development costs from the sales of the VB770 due to the high cost and nich product slot.