After Google Wave, EtherPad is the only Online tool that enables multiple users simultaneously edit a document. By adding EtherPad to Google Wave, we would see much more richer interface in the Google Wave. Some of the features of EtherPad like history, multiuser editing already finds similarity with Wave therefore integrating it to get new features, killing the competition makes sense.
Now I see how serious Google is on changing online collaboration.
What do you think?