Yeah I don't believe tests will replace testers; tests are a safety net for regressions, a safety net to allow for refactoring without changing the in- and outputs, but they are NOT a replacement for testers who look at and work with things from a user's or a business' point of view.

I mean by all means, if a tester finds an issue, write a test to replicate it before fixing it so that it can't recur.

But also, tests are code and code rots. Changing that implementation entirely voids the test. And at some point your test codebase size far exceeds that of your implementation.