Actually the Internet roads haven't changed much. Its been twisted pair copper (telegraph -> 110bd modems -> DSL
(last 80 years)), some coax (various stuff including various flavours of DOCIS (last 50 years), now fibre (which has
seen the frequency increase as the optics at the ends improve (last 30 years)) and a bit of wireless. What has
changed is the modulation of the data (cars) transmitted over it.
Now you can lease fibres or you can lease layer 2 access to those fibres (or do a mix). In either case you get
more speed by changing the technology at the ends (cars) not by changing the fibre (roads). There is no clear
winner over which type of lease to do.
Standardising the technology at each end is what has made the internet grow and it has made the technology
affordable for just about everyone.