Pretty much spot on. In nearly every episode of that programme a fisherman would say something along the lines of 'Back in the day we used to be able to haul tons off this area, we could fill the boat within a couple of hours, not like that now' and fishermen everywhere will blame quotas, climate change, poor spawning years, the EU, bad weather, sea anglers, fish migration patterns, the French, the Spaniards, the Dutch and every other conceivable excuse except looking to their own actions.
There's no denying that the rules governing them were crap and made their dangerous job more difficult but they didn't force them to target spawning fish, use techniques that capture whole shoals instead of just parts of them, hoover up 1000's of tonnes of sand eels, the main food source for numerous fish and sea bird species and sell them for fertiliser, continue to use illegal gill nets, continue to beam trawl when they know how much damage it does to the sea bed and to always push for maximum commercial yields of certain species rather than sustainable numbers. When the EU actually did do something right like increase the minimum landing size for bass the fishermen, instead of increasing their net mesh sizes to allow the smaller fish a chance to escape carried on using their old nets , landed fewer fish and chucked more undersized back dead.
The programme also highlighted something that's common around all fishing communities - most - not all - of the families involved have been fishing for generations and feel like they own the seas and everyone else on the water should make way for them and it's their right to take as much as they want.
If fishing is to have any future the fishermen sooner or later are going to have to realise they'll have to work with the EU to manage stocks. Unfortunately for them the fish don't recognise the arbitrary boundaries drawn on the seas and roam widely, There's not 'British fish' and 'EU fish'. There's also little point the UK catching fish in a sustainable way if the EU allows bigger catches, they have to move together. I can't see it happening though, they're far too short sighted.
There'll always be a market for fish so there are opportunities for innovative fishermen who look at the long term picture. And they need to persuade consumers that there's more in the sea than just cod, haddock, mackerel and plaice.