I don't *WANT* unlimited data. And the question should be invalidated because NOBODY really should want it, since the term "unlimited" is undefined in a relativistic sense. Your "unlimited" vs Google's "unlimited" are two entirely different things. Much less, the average -consumer- vs average -business- user likely has different data usage needs.
Instead, the question should be two fold: what do consumers consider a *reasonable* price and what do we consider *reasonable* data usage for that price. Clearly the providers have done a HORRIBLE job at defining both parameters. So we should step up and at least give them a reasonable target.
To get things started, I'd like to see at least three tiers for individuals (unlike the "Unlimited Messaging or BUST!" craze taking over America): 250MB, 1 GB, 3GB. My price points would be $10, $15, $30. The $15 and $30 tiers would include WiFi tethering if the device has the feature. Customers should also be able to purchase blocks of data (based on their tier size and price) that then roll-over, with a 90 or 120 day expiration.
Why do I price the $15/1GB tier in such a way? To promote LESS data usage, but within REASONABLE limits. 200/300MB is too small for active smart phone users who aren't on WiFi pretty much full time. So that price is pretty much for the people who are stupid cheap and probably aren't using their devices ANYHOW, they're just forced to get a data plan. It is a throwaway plan. The carriers have already decided that 2GB is a max, they want users to use less than that (and the "3GB" plans are throttled joke, just a way to push users off "Unlimited"). But if data usage is too HIGH, we need to carrot-and-stick users into using an amount of data better for everyone. And considering the "average" usage in the US is about 800MB, I think we should promote keeping to that for the time being until usage patterns change or the carriers step forward and stop complaining about "bandwidth shortages".
(Oh, and as an aside, something I have *YET* to see mentioned by the tech rags: the "unlimited talk and text" thing is a result of the carriers getting us primed for LTE Advanced rollout, where voice gets shifted from circuit-switched to packet-switched VoIP. They *have* to get us paying for each voice-capable handset by then, since then the average consumer will finally see how little "data" their calling really required.)