Roger’s post specifically addressed watching British TV.
Although you are quite correct - it will be harder for UK production companies to work in Europe, just as it will be harder for British actors, musicians and technicians to do so.
There might be other channels - but your licence covers the legal right to watch all broadcast material, not just BBC, ITV, C4 & C5 - Freesat explicitly note that it is not legal to watch outside the UK.
My point was just that leaving the EU shouldn’t affect watching British TV all that much - its legal status won’t change from “legal” to “not legal”, for instance because it wasn’t legal in the first place.
About the only thing I can think of is that UK businesses who sell solutions to those in the EU in order that they might watch UK TV will no longer be able to do so.