Will there be iPhone 23, iPhone 35, iPhone 63 in the future?

There might even be iPhone 1005, iPhone 1205 in the car future.

Eventually they'll just adopt the classification they currently have for their Mac products. The MacBook Pro, for example, is only called the MacBook Pro but is differentiated by a string like Early 2015 or Late 2013. Since the iPhone has a new model launch every year, you might end up seeing something like "iPhone (2020)" instead of iPhone 8S (the model that would launch in 2020 according to current naming schemes). Not sure. Probably with how fast they are going

Not sure.

Probably with how fast they are going