Edit: Have I missed the point? I'm sure LinkedIn is a little more cautious about such changes than your average newly-founded startup. This product gives them access to people emails which they can probably glean a lot of info from. They already try to get access into email accounts (username + password) via the LinkedIn webapp so in a way this is just extending that to mobile. The only reason I can imagine them shutting it down is if no-one uses it (in which case, no one will complain).