Yeah that figure is based around the entire digital industry. Games that only release on phones or through services like steam or Psn/live. In the event a game like say, Halo releases digitally and in stores, the physical version usually accounts for 70 or 80 percent. I'd look up the figure but im on mobile but it's easy to find.
Also, most games work fine with no Internet, some are broken yes, I'd wager 90 percent of my Xbox and Ps4 games will be playable in 20 years. Still, you can't tell a vinyl enthusiast that your music collection is the same, to a collector it isn't. Appreciation of a physical object is kind of the main draw.
Also, if they do shut down servers, your digital collection would literally cease to exist the moment your HDD got corrupted or something, which is worse than a disc that can't play for most collectors
Edit: Got to my computer, here is one example of one of the biggest companies citing about 20 percent of sales back in 2015, expecting them to grow over the course of 4 years.
http://www.neogaf.com/forum/showt...
Plenty of examples like that exist, when Halo 5 released and under performed tons of people claimed it must be digital sales taking over, but no, those also only accounted for something like 25 percent of sales. Digital will continue to grow, but the market for physical goods will exist for awhile. Keep in mind, these devices are sold in stores for razer thin margins for a retail company. A company like Walmart might sell a PS4 that cost 350 bucks, and only make like 20 bucks off the transaction (out of ass figure but you get the idea). They are willing to sell on thin margins BECAUSE they will profit more so off the software. If any company releases a digital only console, they won't be able to price it nearly as aggressively. Suddenly your 300 dollar console might become 400-500 because otherwise the store sees no benefit to carrying it, ya know?
There's a lot that goes into this stuff, and especially in the US our laws are very behind consumer rights when it comes to digital goods, you don't even legally own your digital collection or have any right to resell it, i'm surprised so many are willing to dump hundreds if not thousands into something they can never loan, sell, or at least retain until the physical object is destroyed, but such is the way of consumerism