Keeping an established structure also avoids a recurring fiscal cliff every time another temporary extension approaches expiration.

Allowing a major existing revenue stream to disappear could put pressure on education, healthcare, reserves, or other services unless lawmakers replace the money.

California depends heavily on a relatively small group of high earners whose taxable income can be volatile, so further concentrating revenue creates budget risk.

Voters were repeatedly told these higher rates were temporary; allowing them to expire honors that structure and forces the state to prioritize spending.

Another fixed extension preserves current revenue while retaining a future voter checkpoint rather than making a temporary policy permanent.

Tax conditions, migration, state spending, and the economy may look very different a decade from now; permanence removes a useful reconsideration point.

A broader revenue base could be more stable across economic cycles, although replacing billions of dollars without burdening middle-income households would be difficult.