worst case scenario: never
There is no never, fiat currencies are on decline, and they will be gone in one way or another. People really start to lose trust in them , and just wait until the inflation become worse and worse.
Eventually if enough people start to use bitcoin, it will be an unstoppable juggernaut.
I think a vast majority of people who really like bitcoin have been attracted to it because it offers privacy and anonymity, something which no currency has to offer. The reason I think bitcoin even exists is because it is a way of how transactions are made anonymously, something which could be harmful too but that's the very reason why bitcoin is used, on a larger scale.
I think that only the initial users, most people dont give a crap about privacy unfortunately.
But they will give a crap when the food prices rise tenfold in a year, they will need a stable currency, and all it takes is a google search discover bitcoin.
EXPERIMENT:I wrote in Google: "BEST CURRENCY", and it's on the first page 11th result this article:
http://www.economist.com/blogs/babbage/2011/06/virtual-currencySo it's really easy to find if you look for it, they might not look for it now, but later as inflation hits, they will!
Here is Google Trends:
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fi58.tinypic.com%2F1tng4m.png&t=665&c=qEK_CPa3uG7n8Q)
You can see people tend to look for a better currency than they currently have, and with the forecast they will look more and more for it!
Same with "SAFE CURRENCY"
![](https://ip.bitcointalk.org/?u=http%3A%2F%2Fi62.tinypic.com%2F24ctb46.png&t=665&c=ygqvNdI_zuvm_g)
It's also on first page of google search if you search for "safe currency", you can find easily bitcoin there, and the google searches have spiked in 2015, so i guess bitcoin is growing fast now!
So Bitcoin will be growing dont worry
![Wink](https://bitcointalk.org/Smileys/default/wink.gif)