The next step I think would be to create a thread in the alt-coin section and reference it in bitcoin discussion, speculation, and reddit.  This would get people thinking.  

Then a bit later you clone the Ethereum website, explaining your proposed changes.  The cryptocurrency market suddenly realizes that this is a credible threat.  The Ethereum IPO is not taken as seriously as it otherwise would, and people continue to shift away from viewing alt-coins as get-rich-quick schemes, and onto viewing them as experimental platforms needed for the good of the community as a whole.  

If this catches on, new alt coins will need to use the current unspent bitcoin outputs to have a hope of success (otherwise they'll be killed by a clone).  This means that people can just invest in bitcoin, and be confident that they will be piggybacked on new important innovations.      

EDIT: And like Adrian-X said, this "incentivises holding ones coins as opposed to leaving them in an exchange, or an EFT."