Hi, sorry I'm so late. I just found this site.
I vote "yes" on having Joomla 1.0 versions.
I think there is a real need for J!1.0 extensions. Some of us have sites that are very complex, with large numbers of extensions that simply would take too much time and money to migrate over to the new framework. I am truly quite stunned at so many (including the main organization itself) who just slammed the door on us 1.0 webmasters. In the real world of business, even Microsoft knows better than to essentially force users to a new platform without 1) a very simple upgrade pathway and 2) strong backward compatibility that lasts for a very long time. There is neither, really, for complex 1.0 sites.
Enough of my griping.
Thanks for at least not forgetting about us!