we conviced people they had to go to college and get a degree in basket weaving instead of learning a good trade
Desperately needs more data. For example, what _is_ a 'good trade' and has potential employment in those fields remained strong?
Here, for example, there was a shortage of plumbers and tradespeople, to the point where very middle class professional types started retraining as plumbers...but then lots of well-trained Eastern Europeans arrived. The Poles had the advantage of an education system (created by communists, as it happens, who, on account of being very left-wing, had a rather conservative and traditional attitude to education) that still trained people in those fields. British companies have for a long time been very short-termist and very reluctant to train people in anything.
There are some fields that are both hard to automate and hard to export, plumbing would seem to be the quintessential example. But how much scope is there for well-paid jobs for all as plumbers? Especially when at any moment the border might be opened to a country with lots of unemployed skilled workers (Poland had very high unemployment before A8). There are a finite number of houses in the country.
But it's also the case that British people aspired to something more 'creative' and less dirty than plumbing. There are questions of status involved as well. Competition from East Europeans might be greatly overblown as an explanation. I honestly haven't a clue where the balance is. I only have anecdotes to go on (e.g. a neighbour who was a plumber - and getting on a bit - and claimed he could no longer get work so easily once all these much-younger Polish plumbers turned up). But I just wouldn't know what to advise someone to train in, to get job security and a decent income. Everything keeps changing.
And while it's true that universities now offer degrees in things I feel very tempted to be sniffy about ('media studies' 'golf course management'...pah...everything that isn't physics or maths you should probably teach yourself in your own time) it's also true that some of our most profitable exports involve teenage wizards, fictional secret agents and pop music.
Edit - I mean, once-upon-a-time basket-weaving _was_ a good trade.