I expect that hybrid working will continue indefinitely. But that's likely to mean more people wanting to travel on it for leisure. It's already become annoying that it isn't open on a Sunday yet.
But when the line goes through at Paddington and Stratford that is when it should be regarded as working fully. Once people can stay on the train, or just jaunt over a platform to switch to the Elizabeth line it should start to show its mettle. Also I believe they plan to double the through train capacity.
Also are there plans to add more carriages to the nine the trains already have?
Obviously, it might be amazing that the existing passengers get a faster and more pleasant journey with less changes but it would also have been nice for money to be spent outside of London in the other major cities which could have benefitted much more from much less investment.
Nonetheless, what's done is done. Investment in public transport makes no sense anymore. The country can't afford anything anyway now. Look at the graphs of public debt. Lockdowns and associated measures were as bad as ww2 for the public finances.