The problem is "markets can stay irrational longer than you can stay solvent". It doesn't matter when the bubble pops if the governments (especially the US') bail those companies out.

The damage is already being done, whether you are a 401k/IRA holder with a position on the S&P 500 way too overweighted by the Mag7&co and their circular dealings, or just needing to buy computer parts way over their market value because some companies are over-leveraging to outcompete you for that hardware (or electricity), or even at a smaller scale by increasing software costs because everything is "AI-powered" now and of course you wouldn't want only "deterministic" software that just works and doesn't have a slop machine integrated.