Brace for the S&P 500 to plunge 50% as the 'everything bubble' bursts

Sure sure,

people will pull their money off stocks and put them in safe banks

Grantham is correct that we have an everything bubble

but Grantham has also been declaring an imminent correction as long as I can remember, literally decades

you have to remember that these older analysts hail from another era...and it may be that in that era, our financial system was more "factual"...but you can't contextualize the world of 2023 (bullshit laden as it admittedly may be) by contrasting it with 1982...many of today's investors weren't even born