3 and 4 can be fixed with software, 5 will happen over time. The software isn't even close to taxing the hardware on this device. iPad Pro is not even close to being outdated like the original iPad mini was. And everyone that mentions 3D Touch, do we even know technically how that would work on a much larger display, especially if a keyboard was attached? 3D Touch seems most suited to a smaller device IMO. And as far as Touch ID goes, how frequently are people unlocking their iPads as compared to their iPhones? I've had my iPad Pro for several weeks now and not once did I think "gosh Touch ID is really slow". And not once has it failed to recognize my finger.
People can choose not to buy this device because they think it's outdated but then they might as well not buy anything ever. Don't buy a new car because the minute you drive it off the lot it's outdated and you know next years model is going to be better. And don't buy a phone because we all know next years phone will have a better camera, faster processor, etc. I'd rather buy things and enjoy them now rather than waiting for something better...because I'd always be waiting. Technology never stops getting better.