Lol, this is a fun thread. Firstly, entrepreneurship is hard and it takes a lot of hard work and emotional investment to actually build a business from ground up. When we enter into corporate roles, even early stage start-ups, what we dont realise is that we do have a lot of things taken care of, as a founder you have zero when you start :). So it is quite draining, but yeah the rewards can be awesome too when things work out.
So be an entrepreneur if you are willing to do the long yards, dont build dreams of becoming rich through just a few funding rounds. With each funding round you are taking on obligations and more responsibility.
Now regarding the premise of the thread itself where OP questions why people don't want to become rich by learning about business. I feel things are improving significantly now than a few years ago, entrepreneurship is an easier conversation to have with family (whether your family has business background or not). Some successful startups and a whole lot of shark tank is making this the 'cool thing to do' for the masses :). But the costs i spoke of earlier havent changed.
What can make this better?
certain regulations, it takes ages to close a company in india, the alternate is registering in singapore or usa, a lot of early stage startups dont do that.
Materialisation of esops payouts, the more this happens the more people will be driven to start their own venture and trigger this cycle again for a few others and so on.
Lack of interest in people being a barrier today is an assumption imo, i have data neither for or against it. If i were to look at my circle i can find the outcome to be exactly opposite to what OP is suggesting. Maybe the course distribution on coursera / udemy can shed some light :)