Could be. A sufficiently powerful quantum computer running Grover's algorithm can perform a brute force search in O(√n) functions, rather than O(n) functions as a standard computer would. This means that a 2¹²⁸ string could be brute forced in only 2⁶⁴ iterations. This is all dependent on very powerful quantum computers though, which are a long way off.

I think people get too hung up on metal seed phrase storage, and it can actually lead to poor practices. Because of the expense of such devices, many people will just buy a single device and that will be their only back up. Only having one back up is a very risky situation, especially if that one back up is stored at home alongside the device(s) your wallet(s) are installed on. Two pieces of paper in separate geographical locations is safer (not to mention cheaper and easier) than a single metal back up.