&gt;  but they&#x27;ll both be solved by network improvements<p>We won&#x27;t ever have a 100% coverage (with a free roaming and all that). It&#x27;s impossible.<p>&gt; Underground metro systems will need cell towers<p>You&#x27;d have to wait few more centuries for this to happen. They still can&#x27;t get rid of the signalling system from the 1890s.<p>&gt; Alternatively, tube trains could have their own wifi that connects users to the internet.<p>They can&#x27;t even consistently communicate with the train drivers at the moment.<p>&gt; a mesh network to relay signals along series of other people&#x27;s devices<p>In a middle of a desert, in an open ocean, in a taiga, on a spacecraft light seconds away from the Earth?<p>No way. We still need to cram as much compute power into as little space as possible. All the cloud fancy stuff is nowhere near a substitution for it. And no network improvements would ever overcome the speed of light limitations on latency.