A question here:
If I've kept my coins in a hardware and that hardware either blasts off or gets destroyed anyhow (talking about these Ledger and Trezor thing), will I be able to ever regain them?
So long as you have your seed phrase yes you can recover what you need. Those words are the key to everything.
Which when you think about it brings us back to paper wallets. If you wrote it down then although not a long alpha-numeric private key its still something very important that is on paper.
-Dave