How does AI not break the macroeconomic system long term?

If AI replaces even 10 to 20 percent of white collar jobs, how does the economy continue functioning normally long term?

Wouldn’t that mean:
• lower aggregate wages
• weaker consumer spending
• lower payroll and income tax revenue
• larger fiscal deficits
• weaker labor bargaining power
• extreme capital concentration into a few AI firms

The US economy is heavily consumption driven. If productivity growth becomes disconnected from employment growth, who exactly maintains aggregate demand?

I understand the corporate incentive and the geopolitical argument around China, but from a macroeconomic perspective I genuinely do not understand what the equilibrium is supposed to look like if labor becomes structurally less necessary over time.