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Do you know what is the actual limiting factor in train speed? It's not energy, or friction - we can make really fast trains. No, the limiting factor is radius of curvature needed to maintain confort while turning.
Otherwise, we can already make maglev trains that go 600+km/h, for cheaper than the hyperloop, and without the awful design flaws. But you'd need to destroy a lot of property to do so, so pretty much no one is interested outside of China.
No. Its flaws make the vacuum tunnel version entirely unfeasible. Therefore not a good idea. The non-vacuum version is just a tunnel – Musk doesn't get to call that a "Hyperloop" just because he put Teslas in it.
> the flaws are actually solvables
No. But we don't have to have that debate. We can just sit back, and relax, and our lord and savior Elon Musk will solve the solvables. Then I promise to be the first in line to sing his praises and ride the Hyperloop when the problems are solved. (Hint: they won't be).
Can we please stop praising Musk for things he says he will do? Why does this man get to promise all kinds of shit, and harvest the praise immediately?