This is wildly speculative, as expected. Some mice grew dendrites. That doesn't mean anything about humans and doesn't come close to meaning anything about depression. It's not that simple.
Sure - if the underlying hypothesis that it's the plasticity that makes ketamine effective is true, these things also promote plasticity so it's worth looking into. Speculative news articles like this though mostly serve to have people debate and form opinions well before evidence is presented, though, as is what is happening in this thread.
There's a very long road between showing that these drugs promote neuritogenesis and proving their clinical effectiveness.
