If someone buying a used Leon in 5 years time puts LED headlamps on top of his list of requirements they will deserve all they get.
A sensible buyer will look at the whole car and make a sensible decision.
Not having LED lamps is not a
problem for me and I suspect will not be a
problem for a buyer in 5 years time.
We had a Mini Cooper "S", bought it in 2005. The dealer told us that we must have the Xenon lamps, it we didn't we would never sell it. After 3 years we part chopped it against a BMW at the same
dealership, got top book for it and a good discount off the new 1 series. Did he even mention the lack of Xenon lamps, course not.