Does Mobile AdSense make sense?

Google announced today that they are launching AdSense for Mobile joining a number of other players such as Yahoo, Microsoft, Nokia and Time Warner who have launched similar services. Most industry observers believe there is a strong market for advertising on mobile handsets given the growth in the number of devices in the world. The article references several research firms with market estimates forecasting aggressive growth rates for both mobile search and display advertising. Here is where I have the problem. The success of AdSense depends on search, that's how it works. On a mobile device you do a search and you see AdSense ads come up - presumably in a browser if your PDA or device is so configured. The web experience on Blackberries, RAZRs and other handsets with homegrown Internet browsers are extremely cumbersome to deal with. These devices represent 80% of the market, not the 20% comprised of full feature-rich PDAs like iPhones, BlackJacks and other handsets will full operating systems & browsers. The other option that might be more interesting is getting AdSense to work without mobile search. This might be accomplished by utilizing the back-channels in the spectrum to push content to devices that are in idle mode or just connected to the towers. In 2005 we began seeing carriers opening up their handset portals to Google and Yahoo thereby moving aware from their wall-garden approach for Internet access.  The old approach to mobile search was a convoluted connection of WAP, third party mobile portals, search engines, carriers and handset cooperation that resulted in a very poor user experience. You could pull pieces of the ecosystem out to separate the supply chain for a white box solution but there were still too many connections that needed to be made. The other big problem I see here is the revenue model. Mobile Internet searches are not optimized for content buying or advertising because most of the results are informative rather than point-of-sale oriented. Today on the web, you click-through on the AdWord link, that's how people get paid. Ideally you want real mobile commerce where you would buy something with your device and your charge would show up on your carrier bill. Don't get me started with carrier billing systems - they are brobdingnagian complexity of how to extract revenue from the traditional mobile world.