I don't think most ebikes will be radically different in 5 years. Battery and motors will be more efficient. I think we'll see more high end, very lightweight road and gravel bikes with drop bars that are powered by very small, almost undetectable hub and mid drive motors.
I personally wouldn't ever buy an ebike that relies on a cellphone to operate. I enjoy riding many places in the mountains where there is no cellphone coverage. Most functions will work offline I'm sure, but I like to ride with the phone off and in the pannier. I enjoy the ride far more when
I'm offline! I'm sure ebike companies will want smartphones to control their bikes, It's much cheaper for them to develope an app to cover all and rely on the end user to spend a grand plus every year or two on a new operating system.
There's more regulation coming, it's already started. I really liked flying under the radar the last five years. Class 2 and 3 will be regulated more. At a recent meeting with lawmakers we were asked if we would object to having a prominent class 1 license sticker to ride the paths and trails.
Prices now, for the most part, are lower. There will always be the super high end bikes, but a $1500 bike today was $2000+ a few years ago. I expect that trend to continue as long as sales increase. There's already some standardization across brands. That will help drive prices down.
The future looks bright☀