Going back to the Drachma would create the same problems as well, as the new Drachma would likely turn completely worthless, while all of Greece's external debts are probably denominated in Euros and Dollars. So a Greece going back to the Drachma will be bankrupt too, but the with the additional problem of hyperinflation added to mix too.
Hyperinflation, in the extremely rare occasions it happens, is always a temporary situation over a small period of time. Going back to the drachma has a two big advantages to Greece: it will be able to inflate its
internal debts away; and it will cut both incomes
and living expenses in a roughly equal way, thus avoiding the worst of social trouble during the devaluation.
The reason they haven't done it years ago already is obvious: it's the issue of
who gets the blame. It's the same reason Greece cannot count on any help from the rest of the EU: if the Euro must fail, and it must, politicians in the rest of the EU's countries are just fine with allowing Greece to fail first, blame them, and then say that "sadly it made it inevitable that in their country too the Euro be abandoned". The delay has been all about the people in each and every nation involved with the Euro project trying to shake off their share of the blame and put it all on some others.
The Euro was doomed from the start because of its technocratic nature.
Economics is always political. But the Euro was planned for based solely on technical criteria. That the EU would inevitably change in the future, and that such change would require constant
political changes coordinated across Europe to maintain the Euro viable, was never considered. It may have been hoped for by a few euro-federalists, but it wasn't in any treaty, or embodied in the tasks of any EU institution. And the federalists they should have known better: the politics of european nations would not accommodate that. Instead of political institutions created to ensure the survival of the euro, we had just a puny punitive clause about deficits applying equally to every country - as if every country was and would be equal! Which everyone promptly ignored - showing how unrealistic it was! And now have mutual "austerity" suicide pacts (because
everyone knows they'll fail) cooked up according to internal political priorities. Internal politics are what matters, and that rules out any defense of the Euro. Europe hasn't evolved anything in this issue since the failure of the Latin Monetary Union... national factors were and are more important for
national governments! Unsurprisingly.