The slow vaccination access in this country and the slow testing will also delay a restart.
The Cruise lines in the USA seem to sense that and are practically dormant until the summer. In which case a slow start with reduced capacity, won't put money in their pocket in 2021. -Tom
Same with live music venues ... touring acts large and small are booking for fall of 2022, yes late 2022 until live music returns (after many small venues have gone under and Live Nation gobbles them up on the cheap)