I came across this by chance, and after reading some articles about it, I think it is a mind-blowing idea. Open Banking has the potential to give power back to the bank-customer. Very little, but still, at least the customer will be able to shop around for better deals.
I doubt it will come to Canada in the way it should, because the banks here will certainly go out of their way to squash it thoroughly. I mean, just look at what happened to Tangerine Bank, formerly ING Direct Canada.