As long as Bitcoin is unusable for day to day transactions (7 TPS globally isn't even good enough to run a town on), it can't solve any real problems, because its value is just speculative make-believe. And no, Lightning or other L2 networks don't change that, since they don't actually use Bitcoin all that much - they don't actually give Bitcoin's assurances unless you run them at Bitcoin speeds (i.e. close the channel after every transaction, negating any performance advantage).