Fast Internet speeds allow for unthought of innovations. If we get up to terabyte speeds, maybe nobody cares about watching Netflix if we can now have holodecks that become fully immersible experiences that allow for educational training and, to your chagrin, entertainment as well. Maybe LLMs are basically free because everyone can just have all of human content constantly updated.
Letting speeds stall stifles innovation and let's Netflix just continually up their prices for the same 720p content you refer to.