Families with teenagers are the group most interested in superfast broadband, causing Ofcom to question whether there is enough drive to improve internet speeds.
The communications watchdog's Chief Executive Ed Richards said that subscriber numbers remain lower than expected as it is only really multi-user households who have the incentive to upgrade.
"Social networking, streaming and sharing from the teenage bedroom, leading to local contention, the victim of which is the person typically paying the bill, seems to be among the strongest reasons for adopting superfast broadband," he said in a speech at the Telecom World Conference.
"But as an approach to promoting superfast broadband take up, 'having more teenage children' seems a little long term, and a little distant from reality."
He added that there remains uncertainty in the telecoms sector about how high demand for superfast broadband is and how much people are willing to pay for it.
However, despite consumers' seeming unwillingness to embrace fibre broadband, Mr Richards said that providers' efforts to boost the UK's network are going well, highlighting Virgin Media's trail of its 1.5Gb/second service and BT's efforts to rollout fibre optic technology.
"This is good progress and, by any account, positions us well in relation to comparable European countries, if not among the world’s most advanced connected societies," he added.
Earlier this month, BT announced plans to bring superfast broadband to some areas of the UK a year earlier than expected.
Up to two-thirds of premises in the UK can expect to be connected by 2014, a year ahead of the planned rollout date in 2015.
The broadband provider also revealed it would increase the headline speed of its fastest fibre broadband product to up to 300 Mb/second by spring 2012.
Such moves will help the UK government achieve its aim of having the best superfast broadband network in Europe by 2015.