Nothing really needs to happen inside Greece, it's the rest of the world speculating about what can or cannot happen that can drive the price nuts.
This. And part of the current price development is a Fontas-like pump and dump cycle: pump on good news (Greeks need to buy cryptos), dump some five days later. Get ready for a moderate correction this week. We won't see lower than $250 figures, though.
If there had been a messy Grexit with Greek banks going bankrupt it could have sparked a really big bubble. Now it seems like they have reached a bail out agreement the bubble seems much less likely. I think you're right about the dump this week. As more people across the world hear about the bail out agreement there will be more dumps.