I've never been really a fan of the Kirby shampoo system, I have the tools and hose but no shampoo kit - I prefer to wet shampoo my carpets with a VAX machine. A agree about the Kirby accessories, the wands should be telescopic metal like Miele's, and like you say a better floorhead, but how many people actually use all the accessories, expeciall the sander/massager - when I used to show customers the massager, and they heard how loud it was, they just laughed! Kirby's excel in there dry carpet cleaning ability and the reason for the tech drive is not so much the weight of the cleaner, but due to the drag on the carpet of the suction force pulling the head down at the correct height adjustment. I know how hard some other cleaners can be to push - the greater the suction power in air-watts, the harder the cleaner is to push, regardless of its overall weight. Dyson had to modify the soleplates to include air bleed pathways on some of its early model DC07's onwards as the suction was that strong people were complaining that the cleaner was impossible to move on carpets and worse on lino flooring. Kirby soleplates have no air bleed routes and this means that full suction has to pass through the carpet, and thats why the tech drive was put on, with power increasing substantially over the older Heritage/Legend model range (1970-1990). I'm sure the tech drive could be made lighter, but still serve the same purpose, and is a main selling advantage as how many other cleaners are power assisted?
The main things Kirby needs to do, is make the hose easier and quicker to use, improve the quality of the accessories, but reduce the number of unnecessary attachments that most people never use, and make the cleaner sustantially lighter to carry. I am not going to comment on the shampoo system, as I dont have any experience of this since I used to demo it in 1994. Price is still an issue, and many people dislike the method of direct sales that Kirby still uses. I love Kirbys but really dislike the hard sell, pushy, ignorant sales techniques employed by its agents.