IMO what matters isn't the impact on Linux users, so much as the fact that this is totally anti-competitive. The only reason they can get away with it is that they already have an effective monopoly - if they didn't, other companies would be screaming for their blood.
This isn't about creating a monopoly; this is about securing a monopoly against future competition in the x86 PC market.
P.S. Why does anyone trust the OEMs not to leave end users in the cold? Seriously, when have they ever not done that? Remember the capacitor plague?