Seeing the Onion / Fiat pairs is a nice bonus.
Listing coin on certain exchange requires time, money (usually BTC amount) and some conditions to be met, so it depends mostly on Deep Onion team and their effort.
There is no major exchange that will list ONION out of the good will, they will either ask for $$$, or ONION need to win some community vote or similar.
Exactly, once that happens, the price will increase rapidly, it's just a matter of waiting, this project offers a lot of technology with great features, at this moment the ideal is to buy many onions and Hodl, in the long term the fruits will be seen ..