You only have to glance at any "Have Your Say" thread relating to an article on foreign travel on the BBC News website to see that many, many people would still rather the population were kept imprisoned on these Islands; especially it seems among the older (largely vaccinated) age groups so trying to operate airlines and inclusive tour holidays at present, despite all the hype must be very difficult to do profitably at present, though were TUI, for example, to decide the best course of action financially were to shut down for the rest of Summer 2021 and Winter 2021/22 the result would probably losing market share to those that didn't permanently, with possibly even worse consequences for their business and employee prospects.
I was researching the possibility of taking a driving holiday this Autumn, but looking at the requirements, particularly for non EU/EEA citizens, it is an absolute minefield, with Belgium banning UK citizens completely, the Dutch not overly keen and most demanding passenger locator forms making driving through numerous countries such a hassle that frankly it's better not to even think about it at the moment. Things may change later this year, but I'm not confident.