And eventually, the threats that Microsoft makes when an OEM doesn't put Windows on everything will not have enough teeth to be effective.
It's not only the OEM that are threatenend. I heard stories about a big MS client that was making motions to move away from the lockin, being told by an account manager of MS that a lot of unpaid licenses were 'discovered' in his company. If he would upgrade to the next cycle these would be 'forgotten' about. Needless to say this client took the hit and now decided to move ALL his stuff away.
Clients have been harassed so long now that they are determined to escape the embrace and never come back.
"Everything should be made as simple as possible, but not simpler." -- Albert Einstein