If not via Quantam computers then maybe in a different way but will accessing private keys eventually happen?

Imagine checking your wallet one day just to discover the balance is zero, most probably because the private key has been cracked by a supercomputer of sorts.

The elliptic curve signature scheme used by Bitcoin is much more at risk and could be completely broken by a quantum computer as early as 2027, by the most optimistic estimates.

For Bulletproofs, what matters is the Shor RSA2048 line, which is predicted to be broken in 2022–23. In fact, ECC is more vulnerable than RSA in a post-quantum world, so our discrete logarithm assumption may be broken even sooner.