Not really. In actual life tons of people have learned to speak a second language naturally without any deliberate practice, books, etc, just by immigrating to another place and picking it up making acquantainces, working (e.g. menial jobs), and so on.
I'd do it for spanish, but I can't find star trek with (latam) spanish audio.
I personally learn much more from fumbling around with a language, and letting fluent speakers correct me, than I do from listening to it - though both are helpful. I recently had the opportunity to watch a lot of Spanish TV with a couple native Spanish speakers and I learned a ton from it. Through the commercial breaks I'd be repeating phrases from the show and asking them about it - or telling them my theories about what was going on in the show to see if I was understanding it.
I'm pretty sure the originally poster did not mean to never speak at all. But just not to worry about it for a while.
It's pretty simple to speak things that you've acquired (of course it'll be slow and awkward at first, but that's natural), I just don't think there's much point in trying to speak things you haven't already acquired.