I’m still waiting for a banana form factor phone... lol. In all seriousness though there isn’t much else form factor for a phone that end users want. Folding phones are more of a gimmick at this point, there’s no practical market for them at this point of time, I mean android tablets are all but non-existent now, so why would people want to buy the same thing that folds out with a crease in the middle? And is as thick as a suburban?How is form factor a major change? Seems cosmetic to me and nowadays what much more can be done with external design? Ok, I'll grant maybe shrinking or getting rid of bezels so you can have more screen in a smaller device but people seem fixated on the look and shape of the phone, just MHO.
Point is that phones are truly a mature product, and so the hype that came with them is wearing off. It kind of reminds me of flat panel LCD TVs. They were all the rage for years, and now it’s an every day item... now the only way tv companies can make money is by making higher resolutions to a point where it’s almost past the physical eye’s ability to see (talking 8k). At a certain point a product segment is going to become stagnant do to a maturity of the design.