I don't think it's useful or accurate to attempt a value judgment on "disruption" in general. It means massive change, the results of which can and likely will be good for some people, bad for others, and neutral for some as well.

Being optimistic (or pessimistic, really) about such a broad concept doesn't make sense. Could positive consequences come out of any massive change? Depending on your point of view, perhaps, with exactly the same probability (undefined) as negative consequences.

Current companies' and industries' goodness or badness are almost always a matter of perspective (though some are easier to argue one way or the other, again, depending on your point of view). Removing or stunting them with a new paradigm certainly changes things, but rarely if ever in a black and white, "things are universally [better|worse] now" way.