I used to work in tourism.

It really matters which 11% are we talking about. The relatively little people attending conferences on a company dime that won't exit their hotels and will spend exactly as budgeted are probs still there. The richer touristy people who can choose where to spend and are happy to spend on random bullshit going elsewhere hurts more. This is conjecture of course.

I've personally seen - in an unrelated place - tourist crowds getting bigger, hotel revenues getting slightly bigger, but everyone else in the industry like restaurants, activity places and souvenir shops, stagnating and closing as the bigger crowds were because the festivalgoers and young single people were switched out for families who pack their own lunch and primarily only sightsee and do what's free.

Look at Venice, insane crowds from cruise ships mean zero income for the city and its inhabitants because those people eat and sleep on the ship.

It really matters which 11% is missing. If you want to know how it affects tourism, you need data from that industry, data I think the Trump admin will be reluctant to collect.