His point is not only that web apps are inferior. His point is that web apps are
not good enough. Case in point:
TechCrunch goes on to report: "Don’t worry about those desktop apps you think you need. Office? Meh. You’ve got Zoho and Google Apps. You won’t miss Office."
Ah, yes. Corporate IT workers everywhere have to port decades of esoteric business logic codified into Excel macros to Google Spreadsheets, but the real problem is, what are they going to do after lunch? Have you ever tried to use Google Docs for any serious task? In the words of a true hacker, it's like trying to build a bookcase out of mashed potatoes. The Microsoft Office institution will not easily be overthrown by a bunch of jokers writing JavaScript.
Web apps may be disruptive, but that doesn't make them more useful or more likely to take off.