It makes sense to kill it.  I bought one several months ago and felt like it was too much of a compromise.  Too cumbersome to use for voice calling, to put in your pockets and use with one hand.  At the same time, the 5″ screen wasn’t much better than 4″ displays.  Needless to say, I returned it (in addition to the fact that Dell sold me a refurb without ever mentioning it).  

I have had a Dell Streak since July 2010 and love it, my contract runs out in July 2012 and there is nothing out there to replace it with the same size screen.
I find the size perfect, any smaller and it would not be so useful on the internet.
I hope Dell come up with something to replace it.
If I had to change the only other option as far as I am concerned would be the Samsung Galaxy S2 but the screen is a little small, my having been used to the streak.