Success is relative. Voice didn't turn out to be "the next big computing platform". It's still mostly a command interface. Perhaps it still could become something bigger. Alexa isn't widely used on the iPhone/iOS/CarPlay or Android/Android Auto, the two most important places for voice. Alexa works well but doesn't have a clear technology advantage vs Google Assistant (admittedly, Siri is trash).

Contrast that to VR, which is in a much earlier stage of its technology and adoption cycle: Meta has a strong technology advantage, currently has the best overall platform and _if_ VR becomes the next big computing platform, Meta is in a strong position to capture a significant proportion of market share. It's a big if! but at least there's still a chance.