The flaw in your argument Jack is that the Morpheus lockout did indeed lock out all clients, Kazaa & Grokster included. jaan is qualified to tell you more about the protocol changes, which mainly involved stronger encryption of communications.
The only way to force everyone to upgrade, would be via deception or the auto-update feature. Even then, the network should sustain itself. The only reason iMorpheus failed is because it wasn't enthusiastically embraced by a critical mass of users. I'm sure even the most incompetent users would revert to previous versions if the update restricted them in any way.
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