I'm honestly not sure at this stage if the OP genuinely believes it will fail, or if it's more along the lines of them wanting it to fail for reasons they've yet to disclose. Hate to disappoint you, but talking it down won't kill it. Enough people are on board with the idea that they're willing to commit time and effort to improving it. It's only going to get bigger.
Well I'd love to have a decentralized coin with which I could pay everywhere in an instant, that would be awesome. But at this point in time that's just not possible due to the current state of technology. Maybe some day in a future someone will invent a better blockchain algo. But what I know for sure is that LN is not the solution, it's a dumb idea and I really don't understand why people think this will work. If you'd design a system from the ground up, you'd NEVER come up with LN. The only reason it exists is that this was the only thing possible within the bitcoin network without having to change anything in the network itself: someone thought "oh let's use the fact that people can have a shared wallet and change the ratio of ownership without having to do an on chain transaction" and that's how it was born. And then people started figuring out "hey that way we can also route from wallet to wallet". So it's a 'solution' given certain constraints. But again, if you'd were to build a system from the ground up, you'd NEVER come up with LN.