I don't know how useful this tool is for being accurate, but it all depends on two things: more retailers taking coins, and more people using them. If major retailer like amazon takes coin, and it gets easier to buy them with fiat (because it is a pita right now) then I can see the price explosion that makes the previous bubble look tame.
Are you saying that if you could spend your bitcoins on Amazon then more people would buy bitcoins so they could use their bitcoins to buy things on Amazon?
What if they gave like a 5% discount for buying items on Amazon? Would you use bitcoins for your Amazon purchases then?