They certainly instilled fear, it was nicknamed Project Fear for that reason. By the end people were joking about when the prediction of the plague of locusts would be coming. It became a farce and I don't know how Cameron thought he would get anyone to believe it. It was clearly scaremongering. Leaving the EU would start wars. That's funny, we aren't at war with most of the world and they aren't in the EU!
The EU was doing that to us. Over the decades we have lost a lot of our manufacturing and it's not just the east. Basically, we have been weakened. We barely have any trade negotiators and use the EU ones...forward planning by those looking to make us weak.
We have that sentence over here. We have many low paid jobs and now we have companies actively recruiting abroad to bring them here. That's worse because they come for the work and then stay and those businesses lumber us with future problems to support them whilst the companies get their short term profit. The argument from the businesses was that they couldn't get British workers to fill the positions...there was a reason for that as you said.
Sadly, the EU's open borders policy allows unscrupulous practices aimed at profit that dump on the economy later. Such businesses will now be knackered when we leave, and that's a good thing. They may increase their wages.
We have an additional flaw though in this area, one created by our old friend Tony Blair. State benefits were increased so high that there are people who will end up worse off by working. This wasn't the case before. Some people have a genuine concern here - they want to work but because of their outgoings coming off benefits for a low paid job means they can't afford to live. But we also have people who have no intention of working as they see benefits as their right permanently.
Mass immigration doesn't work. Short term gain and long term pain.