We know many have been using it now so it says it all. But still that is not enough to say that it is the future. Many just come and go and bitcoin have been proving good when it comes to being money itself.
Because Bitcoin, being a pioneer in crypto technology has some unique feature which is not available in fiat system and hence the popularity is increasing day by day. I have no doubt that in next ten years we would have a growth rate of 100% or more regarding worldwide users and people would prefer bitcoin over PayPal or Visa.