It has had more hackers trying to hack it than any other tech. But no, there are lot of threats to its existence. Ordinary computers in a few decades. Quantum could happen much sooner. The only protection is hashing of the public key. But there are many public keys on the block chain that still have value in the private keys.
The hackers will calculate the private key and spend the proceeds. There are other threats too, but that's the simplest threat.
Most don’t realize that if technology advances sufficiently to the point where your private crypto key can be hacked, that same technology will bring down every bank account in the world, as all are secured nowadays by similar cryptography. There is no vulnerability to bitcoin that isn’t also a vulnerability of conventional fiat currency/banking.