Okay, I found an estimate of world M3 at $75 trillion, which, if it's at all accurate, makes my numbers not horrifically far off.
ETA:
http://gizmodo.com/5995301/how-much-money-is-there-on-earthFor the narrowest definition, or what's called "M0", that includes only physical money, paper bills and metal coins that constitute currency. That figure is around 5 trillion dollars. The next step up is M1, which includes all the physical money, plus quickly accessed money like that in checking accounts, and comes in at $25 trillion. M2 includes M0 and M1, but also pulls in stuff like savings accounts and CDs under $100,000. That figure is around $60 trillion. And the last figure, the $75 trillion M3, is much more abstract and not often cited in official figures. It includes institutional money market funds, long term deposits, and other stuff rich people possess that can somehow be spent but confuses the rest of us.
ETA:
But actually, I think M1 or M2 is a better measure for this than M3.
Using M1: If M1 =~ $2.5e13, then, at 100%
BTC, 1
BTC =~ $1.2 million
Using M2: If M2 =~ $6e13, then, at 100%
BTC, 1
BTC =~ $2.85 million
I remember reading somewhere about $75 trillion, but I'm not sure and don't remember if it was M2, M3 or whatever.
We need M3 IMO, your quote is describing it in a bit of a strange way. BTC can for sure substitute long term deposits, and what are money market funds, something like a pension fund or so (this might just be a language problem, my mother tongue isn't English)? In that case, it would be better to calculate without those funds.
I'm pretty sure though M1 is not enough, that one is really too narrow. M2 or M3.
Using M3: If M3 =~ $75 trillions, then, at 100%
BTC, 1
BTC =~ $3.57 million
EDIT: I guess something between M2 and M3 would be accurate (depending on what institutional money market funds exactly are and how much of M3 they actually make up..)