I got my last two replacements just before the V2s were actually available to order (outside of the early release).
I imagine they were just waiting for that point to stop offering replacements. Or it could be that their stock of the v1s has actually depleted at this point.
I wish they would do that replacement as well but I think they’d see it as cost prohibitive, especially since everyone would need the new hub which they’ve so far only made available with the Home Monitoring Service.
I plan to just use these until they’re eventually dead if I can’t catch the battery replacement in time, but I’ve started moving over to Homekit stuff for anything new I buy anyway.