I wanted an inspire also. It's such a sexy bird the way it is designed. But if your comparing what you'll actually get in terms of capability then I don't think it makes sense for the average hobbiest/semi-pro. You'll be getting a bird that has roughly 18m flight time and a 4k camera. I think the P4 is actually more capable. Having done some research there appears to be plenty of opinions on both sides of the equation around the idea that the inspire 4k camera is any better than a go pro. Now, there is a new camera that is supported (Zenmuse X5 I believe) that uses a much larger sensor and is supposedly much better.
Maybe if your a pro and need that level of instrument it makes sense. But at current Solo prices its hard to justify for me. I'm going to fly the solo and learn and hopefully by the time I decide that I need more aerial photography capability there will be much more choices. All that said, I also really want to be able to support a local company and hope 3DR can pull it together over the next year.