Yes, digital is the only way to preserve games
However platform-locked stores is not the way to do it. Even if I download my collection in HD/SDs it's judt too tiresome to keep checking if they were all functional and not corrupted and that's to no say the amount of money I need to pay for storage if I want to place them in some cloud
Servers with files, upgrades, patches and DLC should always be online. I don't care if this costs platform holders money, it's their bussines it should be their cost