Some EMBA programs aren't trivial to get into... Especially ones like the Wharton EMBA or the Harvard EMBA.
Prestige aside, I think the value of the MBA (or the EMBA) still lies in the potential to network with other individuals who work in similar spaces as you do. This is probably one of the best / only reasons to do it.
Harvard has an EMBA program? Must be a new program! A few years ago when I was researching, only top institution that didn't have EMBA program was Harvard and MIT just had launched their EMBA program.
I don't think it matters to be considered widely successful, only to better your career, life and your family's.
Just go to any program's website and you will see they are regular people. They will have a list of alumni and their titles. That could give you an idea. These are Directors, VPs and CEOs. Are they "widely" considering successful? Well, they are not as known as say the Pope or the President.
"An impressive 40 of the 100 best paid CEOs in corporate America last year have an M.B.A., according to the Forbes list of America’s Highest Paid Chief Executives."
Prestige aside, I think the value of the MBA (or the EMBA) still lies in the potential to network with other individuals who work in similar spaces as you do. This is probably one of the best / only reasons to do it.