Because the companies everyone claims are now obsolete are making a lot of money still doing the supposedly obsolete things?
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.
Seems like so far the market is not convinced at all that SaaS companies as a whole are any more disruptable than before.