There will not be one method that works for everyone, or every situation. If the main method for monetizing the web is pre/mid/post roll ads then I'm not looking forward to the future of the web. A mid-roll ad works just fine if you're gonna sit down and watch a full episode of Lost, but to sit through a 30 second commercial to watch a 2 minute video on YouTube seems to be a bit much. 

I think that we have to use the medium to it's full capacity.  The web is a very interactive lanscape,  so why are we limited to linear methods like pre/post ads?  I might as well break out  my old U-Matic deck edit station and start editing 3/4 inch tape to tape. The future of web video should revolve more around user interaction, directly in the video. If I'm watching a program and want to know more about a particular object, I should be able to click directly on it and be taken to the site. I do that with ads placed beside the video that catch my attention, why not be able to do that with the video or products in the video itself.  And this is just one avenue of interaction.  Check out some solutions here: http://www.permissiontv.com/products/players_applications

 Aside from revenue genrated from ads, or click through ads, users have got to realize that the content has got to be paid for in some fasion. What would happen if youtube had two types of membership; one that is free that had 30 second pre-roll ads before every video, and one that cost $9.99 bucks a month but had no ads. I spend enough time on youtube that I would gladly pay 10 bucks a month to pay for bandwidth cost s but not have to watch a pre-roll a.