I imagine that all the hotels will need a refit before they can be reused for paying customers anyway. I think I remember reading that the cost of a post-use refit was included in the contracts. Many of them (I'm thinking of Britannia Hotels in particular) have needed a refit for years before they were put to this use anyway.
There's also a chance that many of the hotels will need to be used to house asylum-seekers after their cases have been approved and they've been thrown on to the local authority to house.
https://www.bbc.co.uk/news/uk-politics-67212103
Shaun Davies, chairman of the LGA, said councils were legally obliged to find somewhere to stay for the large numbers of refugees representing as homeless after leaving hotel accommodation when their asylum application was processed.
"We've got a housing shortage, we've got a huge demand on temporary accommodation, and we've got councils in financial strain," Mr Davies, who is also a Labour councillor, said.