Any positive feature, try to spin it as a negative.  That appears to be the game.  

Still, the best argument remains that no one can prevent people from building this network.  And no one can force others to build every single feature into the base protocol.  Some things are naturally going to be built on top, because it's all permissionless.  As to Lightning's success and longevity (or any other feature built as an additional layer, for that matter), that's entirely up to users.  If it provides them benefit, they'll use it.  If it doesn't, they won't.  So why not just see how it plays out?  Arguing from a theoretical standpoint can only get us so far.  Sometimes you just have to go ahead and do something to find out for sure.