Of course the Streak (or should we call it the Streak 1) will of course be dropped eventually.
However I think Dell is in this for the long run and will bring out a variety of phones and tablets. Having said that the 7" Looking Glass Tablet was supposed to be out already. Remember Michael Dell said - within a few weeks and that was months ago. I suspect that they have decided to wait for Honyecomb before releasing.
The killer would be if Dell could make the equivalent of a Blackberry Enterprise Server for their own Android and Winmo 7 phones. I doubt that they have the expertise to do it though.