I don't think Apple is in the habit of offering cheap options, especially for a flagship device -- and with the other hardware you listed, it will be a flagship device.
But price considerations aside, I don't think Apple will ever make any iPad with USB ports. I think USB ports are going the way of floppy drives -- all connections will eventually move to wireless. And Apple has always been at the forefront of ditching old technology for new. It's true that wireless file transfer is still slower and not as reliable as wired, but wait a few more years and it will get thre.
It's very controversial. Some people will say great, I have this USB port, now I can use it to transfer my files. Some will probably say what the hell is this doing on my iPad? What am I paying for? But then, people probably think the same thing about laptops. So I think that there is just as much reason to put it on this as on a laptop.
----------
Apple won't do those specs, they know it would simply detract from the the sales of their other products and apple care about sales more than what users want.
I'm afraid I disagree with you. Apple are always saying that their priorities are to do what is right and put the customer first, and I don't doubt them. IMO they've been doing the right thing for a lifetime.