Today's 2.5 billion voice assistants could grow to 8 billion in just 5 years

In addition to smart TVs, smart speakers and wearables are also expected to crucially contribute to this staggering expansion, although smartphones should remain the largest platform by volume thanks to Google Assistant and Siri. In other words, most people using a digital assistant five years down the line will still do so on their phones, despite a massive projected rise in global sales of voice-enhanced TVs, speakers, and smartwatches.
Multi-platform assistants in general are expected to thrive over the coming years, with demand for standalone smartphone and tablet apps likely to decline, causing revenue to start shrinking around 2022. One final interesting prediction in this new Juniper report concerns voice commerce, which may grow "substantially" soon, exceeding $80 billion a year by 2023. We're talking money transfer and purchases of digital goods here in addition to "more traditional" purchases, and Amazon's pioneering efforts in that space should be bolstered as connected TVs and smart displays continue to boost their popularity.