Agreed. It's the same argument as with phasing out gas stoves/water heaters etc. The ecological cost of a brand new one is higher than continuing to use the one you have, but new ones should all be electric (hence the ban on gas appliances in new construction in a some states/cities). I suppose this also depends on how the old equipment is up/downcycled (stripped for parts, etc)

You're probably fine to continue using the old one but if/when replacement becomes necessary electric is definitely the way to go