In the future, programming will not be done through coding but through composition. I'm a bit biased on this prediction.
Of course LOC != 'contributed value'. Much as people don't assemble in thousands to see a jukebox progress through a playlist but do for the experience created by a skilled DJ, the last 5% is the most significant 5% in programming (and perhaps, all creative endeavors)
I see very few domain problems where the boatload majority of the work hasn't been done for you, and you just glue legos together. Network stack? Most languages have an httplib or you could get libftp or some such from a foss repository.
The only real problem is figuring out which api is easier to use, since there usually are competing choices on a lot of these drop in solutions. qt or boost? django or bottle? backbone or angular?
And besides, someone still has to program these libraries - it isn't turtles all the way down.
Are you insinuating a DJ is not a musician?