I know what you mean but if you wait for the next gen and get it in six months time then - in another six months the next gen goes on sale. In my experience the generation changes are minimal if viewed from a yearly perspective.
My son in law is a professional photographer. He makes a living. He was using a MacBook Pro pre Intel which did the job until last year. I gave him my Intel MacBook Pro (four years old) when I upgraded in November last year. It makes his life easier but he coped before.
It's one of those things, when do you decide to jump on?
Personally, I have a few laptops, a desktop, plenty of other tech stuff so I certainly don't need an iPad but I miss the simplicity of it, the fact the batteries aint too good in my laptops so I have to keep them tethered to the mains.
Portability, well one of my laptops is in a compact convertible format and has a touch screen but it's one of those things where it doesn't really excel in anything it does, it's a very versatile machine but also very average.
For me I find the iPads instant on availability with minimal charging between uses ideal, pick it up wander about, take it with you all a lot more easier than a full blown laptop, and the mini version just distils this into an even more portable format with no loss of functionality or performance.
But, there's the retina display and a faster processor to fit in there yet, so when that happens, I think i'll jump on just to be a little more future proof because I keep my kit for a very long time.