Unprofitable? Really? It's one of the most successful (if not the most successful one?) Y combinator companies (it's not a startup anymore). PG said it was a black swan. Besides, what do I care whether Google will exist? We are talking about Google Drive, and we know very well it could be gone just like that.

Except for the fact that it is integrated in gmail, google plus, android and probably some other services I forgot.

It has generally taken years of neglect for services of Google to be discontinued. Google reader was hardly updated for the last 2 years it existed.

This is a service you are paying for, how many payed for services have been discontinued by google?

> Except for the fact that it is integrated in gmail, google plus, android and probably some other services I forgot.

Its central to the "Chrome everywhere" / Chrome web store / Chromebook strategy, and central to Google Apps for Business (both because "Drive" subsumed the office suite that used to be "Docs & Spreadsheets", and because its a platform for second/third-party apps for Apps users.)

But the Drive desktop sync application is pretty peripheral to any of those things that provide confidence that Drive itself will hang around for a long time -- so if people are thinking of Drive primarily as a desktop sync solution and worrying that Google might cancel that, well, that's probably not as unlikely as the idea that Google is likely to cancel Drive itself anytime in the forseeable future.