Channel reassignment here is defined as an existing channel, changing it's real channel number.
The virtual channel number (what you see on your tuner) may or may not change.
Channel reassignments are are already occurring and are handled differently by various brand CECB's.
If you have personal experience with how your brand CECB handled a channel reassignment, please post with as much detail as possible.
How user friendly is your brand?
Please don't post speculation on this topic if you don't have personal experience with channels being reassigned.
Also, if you must rotate or switch antennas, make note of that because that may alter your results.
How your CECB handles new channels that didn't previously exist, can also be posted. Some CECB's will automatically find new channels.
Disclaimer: I don't endorse any particular brand. Purchasing electronics is a compromise.
Brand selection may not be a main consideration.