Bingo. All too dependent on "hard/soft Brexit" and macroeconomic trends that result from it.
The UK was never part of Schengen so travel into/out of the UK to the Continent/rest of the EU isn't really affected, with the possible exception of Northern Ireland/Ireland if a hard Brexit imposes a hard border there. The tricky part is what happens when air treaties go
pffft in a hard Brexit. But again it's all contingent, and again Hilton will just be riding the macroeconomic tide.