We are actaully doing a lot of that... we will combine products so they work together and restructure our solutions so that extensions can generate solutions. Eventually SiteAssist will be able to create PowerStore, powerCMS sites, or a site of similar complexity.
The thing that we don't want to have to do is discontinue solutions in the meantime. The overall extension vision may take a year or two, and the solutions actually help us work out all of the features people want in the meantime. They are of value to a lot of people, and some of our non-Dreamweaver users may want to continue to have them even when the extensions are made available.