More and more are doing just that, but I'm not sure availability is the prime driver. (or was pre-pandemic)
It maybe quite a while before we see TS demand go back to pre-pandemic levels, but the cost of many TS has now reached somewhat absurd pricing. I was absolutely floored the last time I ate at Akershus. The food was mediorcre, there was only one dessert option, the service was slow, the characters - I'm not sure how to say, but they seemed entirely bored. They barely stopped at any of the tables. I felt really bad for a little girl sitting next to us. She was wearing a princess costume, and a birthday pin (and it really was her birthday- per dad), and the princesses just about completely ignored her. It was heartbreaking to see her go from very-excited to almost in tears at the end of the meal.
Then we got the bill, and goodness the gratuity alone was more than I normally pay to eat out.
Now that people can easily get uber eats and Prime groceries delivered, the appeal of onsite TS has waned. In 2019, I saw a ton of Prime deliveries.