Continuing with this train of thought Cunard should have bitten the proverbial bullet and had QE2 restored and modernized; As you said, with today's market QE2 would have become a invaluable asset to Cunard; The worlds only two Ocean Liners operating across the Atlantic, the marketing team would have had a field day! However unlikely and ridiculous the scenario is imagine a Cunard with 4 sea giants: QM2 and QE2 undertaking regular Atlantic Crossings and their Annual World Cruises, with QV and a renamed QE dedicated to full time cruising. Cunard returned to a "second golden age."
What have you been drinking? Whatever it is you need to add more water!
Totally impractical and nowhere near being cost effective.
She was 'of her era' and even partially moderni
Sed, without a total rebuild, she would still have been 'out of date'! She was riddled with asbestos and the majority of cabins on 5 Deck were 'not fit for human habitation'. She passed USPH only because of an awful lot of continual hard work by the crew and a certain degree of sympathy from the USPH Inspectors. But due to her age she could NEVER achieve more than 94%, which is only just above a failure!
As to running her and QM2 in tandem on the North Atlantic route, there just isn't enough call for that many berths, QM2 does fairly well but it's mainly 'special' trips and themed crossings, where you have a captive audience for 7 days so lectures etc can be tailored. Anybody just wanting to go to NY will fly, if only for the reason that it's considerably cheaper and quicker. You can be in NY and home again before QM2 has even reached NY!
No keep the memories and be thankful that we knew QE2 in her good [ish]days, but don't hanker after a long gone era that wasn't quite as glamorous as our memories tell us.
I'm as much a lover of QE2 as anybody else, but don't let nostalgia cloud your vision of her and her many failings. My 5 years onboard were the best from my 20 years at sea, but i had much better accommodation and food on considerably 'lesser' ships.