I found 8 brands of DVD±R discs—none of them Sony—before I stopped counting. If you think one company stopping production is going to stop people from using physical media, or that demand hasn’t been falling for years, YOU are the one who’s badly out of touch.
Let me spell it out for you: as long as there is demand, someone will find a way to make money filling it. No company, no matter how evil it is, can remove a product category from the market just by leaving the market. Suggesting that a company choosing to stop making a commodity product is an attempt to prevent you from having access to said product is nonsense no matter what company and product you’re talking about, because such a plan could never work.