Firstly, in practice this would be very unlikely to affect a domain for an extended period of time, none of the big providers really treat TTLs like that. It's

Firstly, in practice this would be very unlikely to affect a domain for an extended period of time, none of the big providers really treat TTLs like that. It's the mere spirit of the thing that counts. However, I don't see why changing your nameservers would help if your resolver was always hitting a cache entry with a 1yr TTL.