Earlier quoted context omitted.
So you are suggesting that Poland should give up its financial stability (like being pretty much only EU country which did not suffer recession during 2008 financial crisis) and join Eurozone just to help you avoid small inconvenience with reimbursing business trip in foreign currency?
The Eurozone is suffering. All economic areas have up and downs. Being in a shared monerary union, you sacrifize some advantages for others: we compromise - I know, strange word. We are building a stable, long term monetary union. We are learning, we are improving and we will have a strong currency going forward. Next time another economy area is in distress, as it will unavoidably happen, remember about our crisis,…
Can it survive even if it's unstable? Perhaps. Will it be worth it? That's not for me to say. But you cannot "master the crisis" with the Euro zone without a fiscal union.