I never assumed that, nor that it won't (like you just did). I just said "supposed to replace".
Here is an example. Someone came up with the number 1700 TWh per year for data centers, wifi, computers, phones, tvs, etc. I have no idea, so just use that for now: https://www.researchgate.net/publication/320225452_Total_Con...
Anyone familiar with whats on tv or the internet knows that 99% of all that is unnecessary, even unwanted, crap. That gives 1683 TWh being wasted each year on crap, yet people are only concerned about this 5%. I just want consistency so I don't feel like I'm being concern trolled.
EDIT:
Looking at the visa estimate I see right away it is underestimated by 40%:
>"In calendar year 2016, we used an estimated 674,922 gigajoules (GJ) of energy from Scope 1 and 2 sources [...] Of our total emissions, only 7% were from Scope 1 sources, with 54% from Scope 2 (primarily purchased electricity) and 39% from Scope 3 (mainly employee commercial air travel)."
https://usa.visa.com/dam/VCOM/download/corporate-responsibil...
So Visa alone is about 0.25 TWh per year.
The link I included does actually compare Bitcoin energy consumption to Visa by the way, and the difference is staggering.