"How many internet-connected microphones are in the same room as you?"
It's astonishing how big that number gets. For me right now, it's ~50. And so many of them are made by different companies, assembled in different countries, etc. The chance that someone, somewhere, can listen to you is nearly 100% if you're in a semi-public space. We're living in a dramatically more invasive surveillance society than 1984 ever predicted (that was just street cameras & one 'telescreen' in your home).
And then, add into this mix that we have new market acceptance for devices that intentionally open this behaviour: XBox One, Moto X, Amazon's...whatevertheycallit. There's not only technical capability, but also increasing consumer desire. It's crazy.
Further edits: There's a lot more at stake here, too, if you extrapolate from their[1] known capabilities and combine with actors who may also have motives at large scale. Take Facebook's mood-altering study, for example. We know that someone/Facebook has the ability to alter the moods and opinions of large groups of populations. The same actors can also listen/watch those people in real time. Dystopian scenarios of totalitarian governments exercising total population thought-control is more and more plausible as we all trade our privacy and security to giant corporations in exchange for mere convenience in our daily lives.
[1]: Who is 'they'? I don't know, but there are many possible 'they's and it might be many of them.