I think caseless ammunition will come about. It is going to be cheaper for manufacture in military quantities and the drawbacks are going to be overcome with advancing technology.
Cased ammunition is not going to go away, just because of the reloading capability that offers. Not even considering how long existing guns which use cased ammo are going to last.
Electric ignition is not going to be anything but a toy for a long time, because of the need to carry backup power sources with you. That adds to the carry load weight and bulk.
Advances in metalurgy and carbon fiber and such is going to lighten weapons and extend the life of barrels and actions for high fire-rate weapons. Actions are going to have to figure out recoil absorbing schemes to overcome the drawback of lighter weapons of high power.
Just some thoughts from an old phart.