It you turn parking lanes into driving lanes, you're not increasing the capacity of the existing infrastructure, but creating much more driving infrastructure.

It you turn parking lanes into driving lanes, you're not increasing the capacity of the existing infrastructure, but creating much more driving infrastructure. It also won't 'return' parking to the economy. Consider the 'staying quality' of a <parking lane+driving lane+parking lane> residential street turned into a 3-lane thoroughfare. That's exactly the sort of dystopia that new urbanists and sustainable mobility advocates are warning about.