You do need magnetic cookware so pure aluminum pots are right out but you really don't need expensive stuff.
Hopefully if they ban gas in homes that becomes true here too. But I just looked, and the cheapest induction cooktop I could find was $1,200, 2.2x the price of an average gas cooktop and 3x the price of an average electric.
For a new construction, maybe, but the plumber is already onsite to do the water pipes, so it's not much more to add in a few gas pipes. For an existing house, it's already there. It takes over 100 years to turn over the housing stock, so you'd need to maintain the gas infrastructure for quite some time before you'd start saving any money.
> Then there's the gas consumption, but I don't know how that compares to electricity
Here in the Bay Area gas is a lot cheaper than electricity. But that's because our utility is a crappy monopoly. In cities with their own power generation, like Santa Clara, they're on par with each other.