We are moving to Gmail (Google Apps) and the end users are thrilled to be done with Groupwise. I can tell them all the things they will not have in Gmail; but they don't care because for every 1 thing they will not have they get 10 things the currently don't have in Groupwise.
The industry is driven by end users now. They expect technology to just work and to integrate. They will pick the app that best suites them. Only those of us with Pocket Protectors care about what happens behind the screen. End users expect to be able to go into Evernote; add Groupwise Document store and pull documents. Oops! can't do that. Oh wait. iPad Reminders, sync with Groupwise Tasks - nope.
Oh, and just a heads up. Most kindergartners have email addresses already. I don't think there are that many "NEW" users out there. I would focus on keeping the "old" users before we are all gone.
Do you know what the "old" users need to keep your product(s) as a key components of our IT architecture? Based on the product development road map it does not seem you understand that.