I guess something between 1000 and 10.000 USD.
Haha well that's quite the large margin. I do agree though.
I don't believe it will go much higher, as cryptocurrencies have a limited market. But they can grow in their niche as online payment systems and for remittances and international transfers.
Online payments and the remittance market are hardly limited markets - they're huge. The money that can be saved in the remittance market alone is huge so can't really understand why it wont be adopted by them.