The machines in the future will not be singular. They will have their own evolutionary tree like we humans have our own, meaning they will branch out into millions of different variants, each having their own specializations and adaptions to different circumstances. It will be a literal explosion on a scale our biological minds won't be able to comprehend. Of course, many of us will go along with the ride by merging with them but even then, we cyborg-humans won't be the same to one other. Each of us will be vastly different from one other due to effects of exponential change and lightning fast self-upgrades - like a scaling slide across the electromagnetic spectrum.
But many won't become machine. My self I plan to stay human for 1000 years then upgreade myself. still i want to be more biological and mantain my phyisical characteristics even when I will upgrade myself.