Except you don't buy a product for what it may possibly be able to do in the future, you buy it on what it can do right now.
If a year down the line the UI is quick and all menus are high resolution, they address all the major usability hiccups and they add in functionality that people were hoping for this release, THEN it may be worth a look.
The fact of the matter is the Premiere hasn't done anything that would make a fence sitter get off that fence. Things that kept people from buying an HD are simply not addressed by the Premiere, at least not yet.
The biggest thing though is the timeframe. They're unleashing a product on the market that's barely past beta, yet they've been working on it forever in consumer electronics terms. I agree with the closing of the engadget review, this was the product we wanted two years ago, now it's up to them to convince me it's a product that I'm going to look at two years from now and not have regrets.