I've already checked, and seen two similar capital investment waves: railroads/steam machines in ~ 1890th (and it was even much larger - some sources calculated spending at 6% of GDP) and telecom infrastructure (somewhere 1960s..1990s, spending 1.2% of GDP, just exactly like seen on AI).
And what we see?
- Must admit, some railroads become bankrupt and decades donated from taxes, but not closed, because viable infrastructure; most other suffered from giant wave of Merges&Acquisitions (standard macroeconomic term M&A).
Same wave of M&A happen on telecom market, as I hear from my friends, big business bought small companies, estimated price just on number of clients, and than through all their hardware to landfill (small networks usually built from cheap Chinese SOHO hardware, and instead of routers used PCs) and rebuild all hardware part from scratch, based on telecom-industrial grade hardware.
And really, all modern European transport and telecom infrastructure is from these two waves of huge investments.
Honesty, railways are still moderate profitable (many very significant, like England-France tunnel are unprofitable), and similarly, telecom infrastructure also not much profitable (suburban and rural are in many cases donated), and same problem was with data-centers before AI.
If capital investments into AI will end on current level, this could be considered just second wave of telecom investments - as I said, first wave was huge, but civilization survived and we now actively using fruits of these investments.
If investments into AI will exceed railways level (~5.5x telecom investments), this also will not be end of life but sure need many more profitable AI products than we have now.