I have a shower at my studio, and it is hardly ever used. One the other hand, I train mainly older adults or people with some sort of limitations, and they are not the traditional ‘gym rats’ who go for a workout before running to work.
Looking at your profile, I would expect higher intensity training with the absolute need for a shower afterwards. Most people will go home but you will lose some business if you cannot provide one at you studio. How much is anybody’s guess but if you providing a really great experience then people will accommodate to some to you.