So is the theory that low returns on savings will get the boomers spending again?

One of the articles i read reporting on the IMF blog was a little blunt saying the opposite. "Its not about the Boomers, they have had their day"
That is another reason why being a boomer is good - you can ignore all of these juvenile hipster “experts” and do your own thing undeterred as usual

We have learnt that no amount of speculation and hypothesizing about the future is worth the paper it's written on

there will always be another 911 or Ukraine....which jumps out and stops the world or another SARS variant to name but a few recent ones, oh did I mention Liz Truss.
Not sure the top table of the IMF can be described as "hipsters". You missed the biggest man made or should i say Boomer made disaster of all time, Brexit off your list. Not that that can be repeated, well not in boomers life time anyway.
I fall on the border of being one but see if more is not done to improve the financial prospects of the younger generations (each generation is supposed to be better off than the one before) than this country which is already a poor country pretending to be rich will sink.
Come January 2025 the lunatics will be in charge of the asylum. Savers beware.