Ok, so are we betting on this or not? Doesn't have to be a monetary bet.
Tourist revenue would need to be compared to what it was for similar time periods in 2019 for each country. For Europe I expect some countries (e.g. Italy) to be down while others (e.g. Spain) to go up. Europe still has the situation where many people are avoiding air travel and will vacation closer to home - but over 70% already vacation in their home countries in a typical year. Keep in mind that many European businesses have a long August vacation period -- which is what really drives EU cross member states vacation revenue. Vacation in the U.S. is through the year or clustered around extended holiday weeks/weekends.
Europe also has a good train network that enables tourist trips of moderate distances as an alternative to air travel.
Another thought is that European residents are less impacted by unemployment than U.S. citizens due to better benefits and social safety network. U.S. vacations this summer may decline simply due to the large number of unemployed who are losing their additional federal benefit at the end of July.
I will not "bet" on these type of things. I simply will say that we should do a country by country comparison versus the same month(s) last year when the August data becomes available. It is actually of more interest how this EU re-opening from COVID changes European tourist travel patterns.
Here are the typical EU vacation stats and profile from 2008 to 2018 -- to show the typical time.
https://ec.europa.eu/eurostat/stati...statistics_-_characteristics_of_tourism_trips
"In 2018, EU residents spent on average 70.5 % of their tourism trips inside their country of residence."