Incorrect, particular sets of ciphers are themselves doing just fine. There is no hint of well studied symmetric-key algorithms (like AES, which is in fact now over 20 years old) with long known sufficient key lengths "failing" (in terms of cold ciphertext being cracked) in 40 years, or 400 years for that matter. Even with a fully scalable general quantum computer, the best known improvement is Grover's Algorithm, which results in roughly a quadratic improvement (so a 128-bit key cracked in 2^64 iterations, 256-bit in 2^128, etc). This obviously is trivially defeated by doubling the key length, and AES-256 has been available from the beginning and has been becoming more standard for a while as well.

Now, there are various kinds of hot attacks, such as side channel leaks, that always present a serious challenge in many threat scenarios. And it's certainly possible to have bad implementations of a solid algorithm. But for AES implementations are very mature, and side channel attacks do not apply to data at rest. So in the context of "will my encrypted ciphertext with all my deepest secrets [sitting on a drive/in the cloud/wherever] be crackable in 40 years" no, symmetric-key crypto with 256-bit keys is dependable at this point.

A false sense of defeatism is itself plenty dangerous to security.

Encrypting is still better than not encrypting and if you care about keeping your data private then you can take additional measures to ensure that. Nothing will last forever but that's not a good reason to be nihilistic.

Triple DES remains as secure today as in 1975.