For starters, the EX500 isn't gone...heck the EX250 is in its 20th year now IIRC. I just think its size and price will make the 650 available to entry-level riders.
Overall, I liked the design of the bike. In fact, I think it is a shame the frame is hidden by the bodywork. The swingarm isn't particularly stout but it looks right for a bike of that size and power. The rear shock looks like it will be very easy to replace for track duty and has easy access for making changes. My biggest issue was that the bike felt larger than I was expecting. I'm a big guy so I would expect it to feel small and it didn't. It has an upright riding position and tall wide bars. Of course, little things like that can be changed easily...
I also heard a rumor that they will be getting aggressive with contingency money to get them out on the track in full force.
Rarely is the question stupid, but sometimes the answer is
you need to run everything you read online through your own personal BS meter to determine if it makes sense to you.