I agree that radical changes to the CLC Warrington line service as suggested in earlier posts would require construction of NPR/HS2b and a Piccadilly to Cornbrook tunnel for Metrolink. I also agree that the time frame is many years hence, but frankly, the UK is unlikely to have the financial and other resources for such major infrastructure projects in future, nor the authoritarian determination to undertake them, so I doubt whether they will ever be built. The UK is rapidly slipping down the economic league, exacerbated by Brexit and the Covid crisis, and is now at serious risk of fracturing. The UK was a world leader and global economic and military power in the 19th century, after all, Manchester to Liverpool via Chat Moss was the first main intercity railway line in the world. However, the 21st century will be dominated by China. If Manchester was in China, I'm sure that all these radical proposals would be achievable by 2030.
In the meantime, some lesser affordable improvements to the CLC Warrington line are desirable - 25kV electrification would facilitate this.
There is a lot to unpick here. The UK is not ‘slipping down’ the economic league in a sense that it can impact upon our ability to build new infrastructure. The fact that the UK was the strongest economy in the 19th century and is now the 5th, 6th or 7th biggest economy (those three positions are relatively close and there is a big gap between the UK and Italy & Spain) does not mean we can’t build new roads, railways, airports, ports, power stations etc.
You also cite weakening financial strength, which I assume you are thinking in terms of the national debt as a result of covid (apologies if I am wrong on that assumption). The idea that the country is ‘bankrupt’ and that “there is no more money”, as some people put it, is nonsense. Events of this scale need to be paid for in the same way that we paid for WW2 and the abolition of British involvement in the slave trade, with payment spread out over many decades or even more than a century.
So given that the country has the ability to spend circa £4bn-£4.5bn per annum over 20 years, on a project that can facilitate improved travel across 5 different mainlines - HS2, WCML, ECML, MML, XC (Before people jump and say XC is not a mainline, the core will benefit just as much as the other lines) - it makes sense to press ahead and allow future generations to reap the benefits.
In the 19th century, the country had the highest national debt levels as a proportion of it’s GDP in it’s entire history up to that point, being over 100% for whole first half of the century. In that time, the UK government authorised the greatest programme of railway building we have ever seen. National debt next peaked at WW1, again higher in WW2 (reaching over 200%), where we then embarked upon creating the NHS, the welfare state, a whole network of airports and motorways. Now with Covid, national debt has again peaked, hitting 100% of GDP, where the government is looking at a comparatively small level of infrastructure investment with HS2.