"I do find it saddening that so many people refuse to even consider that there could be a better future, and are happy to leave everything in the hands of someone else."
Isn't that exactly what you're doing where "someone else" is ToTW?
The really saddening thing that so many people refuse to consider that as long as we're a member of the EU the EU isn't actually "someone else", it's something of which we're a part.
We shouldn't really be looking at the EU as a trading partner but, for any large and many specialist small businesses, as the home market. The disruption of losing such a great proportion of their home market is such that many businesses are likely to go down the tubes or relocate before they can benefit from any great bonanza the RoTW could provide.