Actually in some consumer strong countries/territories UK/EU/Aus you will be able to get a new Mac Pro every couple years. After all you could say that my $8000+ Mac Pro died within 5 years and it’s not reasonable for a computer that expensive to die so early and get a brand spanking new MP each time.Yup, making a necessary part proprietary, and then refusing to supply that part to the market, in order to provide a competitive advantage to new equipment would be a serious act in many jurisdictions.
For those in US, yeah you’re stuck.