Why would anyone get rich doing something easy?
Seems like so far the market is not convinced at all that SaaS companies as a whole are any more disruptable than before.
Most people book flights online, travel agents still make a lot of money. Doesn't negate that travel agency as a business is economically worse than ever.
Most people have cameras in their pockets that can take good photos, photographers still make a lot of money. Doesn't negate that being a photographer is economically worse than ever.
Hopefully, you see the pattern. You don't remember that companies that are no longer around.