For Bulletproofs, what matters is the Shor RSA2048 line, which is predicted to be broken in 202223. In fact, ECC is more vulnerable than RSA in a post-quantum world, so our discrete logarithm assumption may be broken even sooner.
Whilst it's true that ECC is more vulnerable than RSA, this is only a question of scale. With sufficient qubits, both can be broken, it's just that it takes more to break the equivalent RSA.
The problem here is that ECC and RSA are both asymmetric approaches. A
symmetric approach such as AES256 offers far greater resistance.
The difference between the two is the QCs best method of attack. For asymmetric cryptography, Shor's algorithm is the answer. For symmetric, Shor's approach doesn't work, and Grover's algorithm is the approach to use. And whilst Grover does reduce the difficulty somewhat, it is nowhere near as effective for symmetric systems as Shor is for asymmetric systems. I presented the numbers in a different thread, and can share if anyone is interested.