So accordinng to your graph nobody needs unlimited data? I know of nobody neilssen asked, proves nothing.
Nobody needs unlimited data? Huh? That doesn't make sense. Unlimited data is an infinite amount. Do you understand how averages work? You might want to re-think that question.
BAHAHAHAH, who they "asked" oh lord... You realize they pay Verizon, ATT, TMO, etc etc for your data, right? You opt in through your terms of service. Do you really think Nielsen still gets most their data from calling people and asking them questions? Heck it wouldn't surprise me if MacRumors is selling the data from here to them so they can analyze the trends in forum discussions.
Almost every aspect of your life is shared with Nielsen or other data collection companies. Your electric company shares your usage data, your internet company, your water company, your cellphone company. Even if you opt out, you're only opting out of certain things like personally identifiable information, but not general data. You don't know anyone who nielsen asked... bahahahhaa.