You are very correct Keatah. The survival rate for modern games is looking to be abysmal. I should have specified my statement, as I was thinking more in the sense of old cartridge-based games rather than games found on discs or even online platforms as you mention. I would even argue that there's a good possibility of cartridge-based games surviving longer than other forms of video game media because of their simplicity. Carts don't get ruined by slight scratches, there's no need to connect to an online server or get updates, etc. The only concern would be needing the capability to replicate the hardware that the cart's ROM needs to play on (through original hardware, emulation, FPGA, or some other means.)
Those are impressive efforts you've made in working to preserve your digital collection the best you can. We all truly still have yet to see what the future holds in regards to large-scale computer and video game archiving and preservation, especially when these items will be a century old, and we (along with the people behind these systems and software,) are all elderly or deceased.