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I will say this, disregarding any DRM schemes that are put into place, I feel digital will be the only way to actually have something forever (Forever being however long you want it). Physical things rot and deteriorate. Really old cartridges and the connectors for cartridges on game systems can fail. I mean who can ever forget about just blowing into a cartridge and hoping it then works? haha. But they do eventually fail. CDs, DVDs, and Blu-Rays can suffer disc rot and become unplayable. And there are a myriad of other things that will just cause physical media to eventually become un-usable. Of course in many cases these process can take decades to fully destroy everything, but if we are talking about preserving the game's themselves and being able to play them whenever, no matter how far into the future it may be; keeping a digital archive is the best way to maintain that. Preferably, it'd be a solution where the archive is stored at multiple places at once just in case if there is hardware failure on a one end, everything is still saved somewhere. It does mean not having a physical collection to display...but I'm sure you can replicate that somehow with like blank game cases and boxart if you have the money lol.
