- Nobody can expel Greece from the eurozone according the valid EU law. Also, no external force can make Greece printing its own currency. Unless, of course, Greeks would do that deliberately.
- They won't. Only a minority of Greek voters would welcome a new drachma. Syriza, the ruling party, has never promised it would seek leaving the euro, by the way.
There are top political priorities of Syriza below. Abandoning the euro is simply not there. Debt repudiation, yes, but not leaving the common currency: