People ask this every year.  How long is a piece of string?  It's all speculation until we actually see it.

Personally, I think that while things are heading in the right direction, there's still a fair way to go before we're there.  Many still argue we're quite early in the adoption curve.  

In terms of "blockchain" adoption, however, that's largely unimportant.  Any companies adopting (or perhaps co-opting is more accurate) blockchain are just building walled-gardens for the cost-saving benefits.  They're not actually creating something for users to see any benefits.