Ethereum can not rely on the sublevel solutions in a way bitcoin does with lightning network because these two blockchains have different goals in mind.
That is why the scalability issue of ethereum should be revamped. Besides, the proof-of-work mining should be stopped. Because the amount of empty blocks mined has been increased by 600% since recently. There are no transactions recorded in the empty blocks, so no real benefits for the network. They are mined faster though, so the miners opt-in to mine the cryptocurrency as much as possible before the developers reduce the reward.
Ethereum is having a couple of problems recently, because we saw ethereum getting a bug freezing the blockchain from transactions, and that bug is due to the test of ethereum's Constantinople hard fork and now the amount of empty blocks increased to 600%.
Ethereum!! You should get your things right before it's too late for you.
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