Noting that newspapers aren't necessary (but journalism is) is great, but the problem is that a lot of (most?) journalism is still done in newspapers... and the way the media is currently breaking up, where companies like the Tribune Company and Gannett are splitting their television holdings from their newspapers means that journalism and newspapers may not be inherently tied together... but when it comes down to it, they are still for all practical intents and purposes tightly coupled.
Web based news orgs like Vox, Fusion, Gawker and Buzzfeed are making some moves towards funding journalism (Buzzfeed in particular has great investigative reporters), but they are way too few in number to replace newspapers as a home for investigative journalism even as the industry stands today in its depleted state.