Valid point, but we are decades away from putting the whole world on Bitcoin. In those intervening decades lightning alternatives and/or derivatives will likely be developed that can allow the entire world to use Bitcoin.
But of course LN makes no sense if you just did what Satoshi said and incrementally increase the block size as needed, but then of course Blockstream cant sell you their SideChain(tm) products.
The whole thing became really convoluted and dumb once Adam Back got involved.