I'm not quite sure what point the consultancy is making on the future mobile-data rates. The article says:

However, it claims forthcoming 4G technologies will significantly reduce those costs. "Forward-looking estimates which take account of the transition to LTE [Long Term Evolution], additional spectrum and traffic subscriber growth... puts the cost to the mobile network operators at under €1 per GB,"

Does that include the cost of the 4G licenses? In the UK these haven't been issued yet. If an operator pays £4bn [1] for the license and has 10m customers it needs to charge an extra £1 to every customer every month for 33 years to cover the cost of that license. That's not an inconsiderable amount before we begin talking about data.

[1] Costs based on UK 2000 licenses: http://news.bbc.co.uk/2/hi/business/727831.stm