I work in this industry, and this does not match the data we're seeing. People are eager to get back to certain on-site experiences, especially on the boutique/expensive side where the in-person class/instructor camraderie is very important. Also certain genres of fitness (think: cycling, F45, etc) require expensive equipment which is non-trivial to have in your house.

Data on countries that have re-opened (like Australia) is showing that it's they will quickly reach or exceed pre-pandemic levels as long as they take some safety measures.