I'm looking forward to cordless vacuum technology improv
Corded vacuums will continue to have their place for the foreseeable future but cordless is where the action is today. I'm not a big Dyson fan but the V15 shows cordless vacuums are taking steps towards replacing corded vacuums every year. The V15 and V11 Outsize are the first cordless vacs to really have some performance numbers that are actually good. Hoover's Onepwr bagged upright is also interesting along with the Oreck pod. It's interesting seeing cordless direct air machines and I think cordless direct air machines may be answer to replacing corded vacuums eventually (for the average household). The only catch with direct air machines is that they have to be bagged as far as I know.
I've actually come around to accepting bagless machines even with their shortcomings. It's not that I like them, it just is what it is. People like feeling like seeing the dirt they pick up. It's a positive feedback loop that bags don't provide as easily.
Regarding vacuums I want to see in '22. I want to see more upright cordless options like the Shark Vertex Upright (successor to P50). Stick vacs are okay but I really like Shark's implementation of lift away designs. The Shark liftaways give you the benefits of both uprights and canisters.
The other things I want to see in '22 is newer and more modern designs from establishment vacuum companies. I'm talking about Kirby, Rainbow, Sanitaire, Riccar, etc. Sebo has a good vacuum with their Felix/Dart machine. Miele has some good vacs but I would like to see a better version, maybe bagged version, of the Triflex.
As far as I can tell, whole home carpet is dead and carpet is only being put in bedrooms, stairs, and other limited use situations. Hard floors seem to be the only thing in vogue currently and I don't see that changing anytime soon. With that, I would like see better hardfloor heads. The fluffy motorized rollers seem to be the best solution at the moment but they have to be cleaned frequently. Some of the brushed straight suction heads seem okay but they don't appear to outperform the fluffy heads. Vacuuming hard floors with a normal motorized brush head with the roller turned off seems almost worthless.
The reality is that a lot of dust on hard floors isn't going to be removed without some form of minimal agitation. Perhaps a company will develop some form of mild ultrasonic head or something that can use straight suction.