If Greece exits the eurozone, what actually happens to the existing debt? And will their currency actually have a lot of value? Just seems like a huge mess and I'm thankful I'm nowhere involved with it. I can't imagine what it's like for everyone involved.
A default happens and the rest of europe have to deal with it. Just like when a default happens when you lend money to someone. As far as I know, Greece isn't forced to pay back, they can leave anytime they want (and deal with the consequences of being outside of the EU).
Tsipras stressed on how important it is for Greece to be a part of the Eurozone, for all the benefits it shares regardless of the financial blessings they often receive. If Greece starts from scratch and have their own currency, it would be a really hard process for that to happen. Also, it would display mis-trust and be recorded as a default which would also eliminate them from any trades in the global market. There will be no globalization in Greece, no foreign brands will be be sold in Greece.