Kushina said it.
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I'm talking about actually dying, such as being burned down by Amaterasu. The only time Tailed Beasts have been said to regenerate is when they are killed inside of Jinchurikis, where they don't actually die regardless.
Minato
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Tailed Beasts aren't seen outside of their hosts in this manga, so their is nothing to support that. We can only assume that when a tailed beast dies they are reincarnated regardless.
if they die with the host and regenerate why would the same not happen if they weren't sealed? The proof given above still stands
Then what was the big deal about burning the Juubi down?
Nothing would have happened.