If Facebook launches the stablecoin they are reportedly building, it will quickly become the most used product in crypto,
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here Anthony Pompliano, a crypto analyst and founder and partner at Morgan Creek Digital Assets tweets about this
https://twitter.com/APompliano/status/1075951717399838722?s=20mass adoptions in crypto is on its way

if it is the currency only for WhatsApp messenger then i doubt that it will be the #1 digital currency. From other side it may be a competitor for GRAM (Telegram currency) and it is definitely good, we will have a healthy market with a healthy competition.