Yeah, there's definitely an incentive to switch in the short-run. This is especially true for people who have had family plans in the past and part of the family wanted to cancel but didn't because they knew the other part of the family still used the service.

If competitors took the opportunity to crack down on account sharing as well, there might not be as many switchers. Honestly one of the things that NFLX might be testing out with these pilots is how the competition will react. Maybe they're giving Disney/Amazon time to get their systems set up for a crackdown, since that would help NFLX, and in the long run help all of them.