A huge part of the benefit of software like Mulesoft's is being a common standard. If your the type of company that will have 50 developers working on your ESB and services that's big. So is the expectation that in 30 years you can hire a new batch of developers that will quickly grok your ESB because Mulesoft will still be a thing.

Mulesoft does have a lot of cool functionality, but my impression is that unless you are the type of organization with dozens of systems, decades long timespan, and dozens of developers that Mulesoft isn't worth the money.