They need to go back to the basics. No tech drive, no giant handle, etc. The D50 was probably their magnum opus. It was still lightweight like the early 500 series and had the comfortable, small handle. But it also had 2 speeds, a better bag connection, and a more powerful motor. I think they should modernize the D50 design, maybe add paper bags, plastic fan, and a cord that is harder to remove. It would make it alot easier for many people to use, young and old alike. Maybe do away with the hose and attachments too, not many people care enough to use them for the effort they take to connect. Being as it is a direct air system, there really aren't any ways to have a good, quick way to use the tools unless they are on board, which is another can of worms. They should probably sell a companion mini canister vac, like Oreck did.
The amount of people I have met that have stored, chucked, or given away their Kirby as it was "too heavy" or hard to use is astounding. Said machines are always Classic, Heritage, and Generation body styles.