Are there any long-term plans to lengthen it? This would certainly assist in providing the airport a competitive advantage over STN for long haul holiday traffic and cargo development.
LTN is virtually full at present so its never going to be a priority to add another couple of thousand feet of tarmac to the runway just to entice the odd long haul wide-body!
The Herts NIMBYS would throw all the toys out of their Waitrose shopping trolleys long before anyway!