potential to make cable and DSL as antiquated and pointless
Sorry, but this nonsense on so many levels.
5G is just Mobile Wireless. Fixed Wireless can deliver up to 16x performance but is MORE expensive than Fibre unless it's Rural 20km Line Of Sight. Fixed Wireless needs rooftop aerials and LOS to get the performance. Mobile, NO MATTER WHAT xG, is limited to roughly 0.8GHz to 2.3GHz frequencies (Physics).
5G doesn't change the mathematics & Physics of Wireless. EVERY other lamp post would need to be a fibre fed femto base station.
Only fibre can make DSL and pure cable obsolete. Hybrid Fibre Cable beats Fibre to cabinet + copper pair (VDSL etc) because cable can manage over 1GHz of bandwidth. A Copper pair struggles to do 0.03GHz of spectrum and slows rapidly with distance over 100m and crosstalk. Cable can manage a 1GHz of bandwidth (certainly over 250Mbps per user) at over a 1km, however for new installs / routes Fibre to the premises is better. It can go anywhere with existing water, electric, gas, sewerage, poles or ditches.
The 5G is an excuse for Infrastructure companies to sell upgrades, Mobile companies to try and replace WiFi Hotspots (fed with Fibre, cable or DSL) with mobile femto cells fed by fibre.
All decent Mobile bases or Femto cells need fibre backhaul anyway.
The 5G is more about integration of services, not faster or higher capacity Mobile, which can only be achieved by treble or x10 number of base stations, no Return on Investment to give better performance as it won't bring in more customers or revenue, only increase Capex and running costs.