Yes, just the same way that DTAs are given out today so people with older analog-only TVs can still receive service once their system goes all-digital.
Just like with the analog-to-digital migration, I envision a time when there will be gradual reductions in digital video QAM carriers while video service starts moving to IP QAM ones. A similar "IP Transport Adapter" (IPTA?) device would then need to be provided, once systems go all-IP transport, for use with non-IP TVs.
People will still be renting STBs for a while until all those old non-IP TVs disappear in the far future.