Liberty Global clearly disagree with your assessment that VM may be out of business in the next 10 years going by the £3 billion investment in passing more premises.
If Liberty were to hand the company over to 'computer' people I'm sure it would be out of business in 10 years.
There are very good people working in capacity planning within VM, however they can't work miracles. Unless you can figure out some way to defy the laws of physics with regards to space, power and cooling the issues that are there at present will continue for a while.
I should also mention that VM do not try to run a network that's free of visible contention, and due to how competitive the UK market is they simply don't have the revenues to do so. The model they manage the network on isn't outdated, they use capacity planning models recommended by vendors.
Working on a 100Mb product that can be 'used to the max' at a competitive price isn't going to win many customers, but will definitely lose money. They'd get torn to shreds in the marketing.
VM are spending tens of millions a year rebuilding networks, alongside upgrading cooling and power within sites and indeed fundamentally changing how the network operates, and this will carry on indefinitely.
VM are not and will never attempt to compete with the likes of Andrews and Arnold, and they don't have the luxury of massive TV revenues to subsidise broadband as Sky do, or a legacy network that can be sweat with relatively minimal upgrade costs.
VM already allocate more capacity per customer in the vast majority of areas than BT Wholesale do. Local issues are the nature of the network.
I'm going to go and get hammered shortly at a neighbour's, just because, however I would be more than happy to add lots more colour to how VM's network works, the capacity planning strategy, and the upgrades in progress.
In summary though:
Removing legacy equipment, Cisco uBR 10k, Motorola BSR 64k, replacing with Arris E6k and Cisco cBR 8
Replacing legacy CPE that rely on even more legacy equipment such as set top boxes that require the Cisco uBR 7200 VXRs - these were the original equipment delivering broadband services in 1999.
Rebuilding networks, replacing limiting RF amplifiers and optical nodes with equipment with more RF bandwidth, in some cases shifting from 45 MHz upstream and ~600 MHz downstream, for everything, to 80 MHz upstream, 1.1 GHz downstream, field modifiable to 195 MHz upstream, 900 MHz downstream
Migrating hubsites and headends to CCAP to allow more efficient use of RF capacity on networks
An ongoing program of splitting optical nodes via increasing fibre count and using WDM, placing fibre deeper into the network to reduce the number of customers sharing bandwidth
Increasing the bandwidth to each area as a result of the above, moving from in some cases 600Mb downstream, 38-57Mb upstream to 1.2Gb downstream, 108Mb upstream, and reducing the customers sharing that increased bandwidth by 50% or more
Regrettably not as simply as blowing another fibre from an aggregation node and lighting it, or paying Openreach or Wholesale for additional capacity to your own switch / LNS.