China now has enormous influence over the Eurozone economies. The implicit threat is that if the countries of the Eurozone do something the Chinese government doesn't like then China might decide to sell Euros. Right now it doesn't suit China to dump Euros. This has more to do with politics than economics.
China has enormous influence
globally (recall how Hu Jintao expressed concern over US Treasuries about 2 months ago...) since they are the only ones with growth. However it's a precarious balance for China as well, since as many speculate, and the thesis has some validity, that the government has no choice but to keep it's foot on the economic gas pedal, as the tipping point in social unrest is 12% unemployment, after which potential protesters outnumber the Army. A sobering thought. Unemployment is currently 10%, however underemployment due to the Hukou (local passport) system is estimated at 30%, this means 1/3 of the citizens live as second class citizens in the big cities, and smaller ones, which for China means population of 5-12M. Economically speaking, if China dumps their euro holdings, they'd loose their silk shirts, so I think there is some strong self interest going on as well.
It's true that most euro trade is within the EU zone, but you have to think that it won't just be Germany's automotive and mechanical exports that will get a boost from a cheaper currency. Perhaps as Tom-Cat says tourism will go up. I had not thought about Ireland's situation - your point makes sense. I'd like to think they are not the only winners from the $1B bailout...
With all world economic powers propping up the euro, it's life cycle has to be extended, how long, and how it will be configured politically, can only be speculation at this point. If Germany takes on a similar role to say California, who has been paying 20% more into Federal coffers than is being paid back, then it maybe a period of 20 years where Germany is required to pay more into the EU, through either loan subsidies, or easy money policy, meaning taking worthless sovereign bonds as collateral, before the markets re-balance. This seems unfair to them since the Northern provinces like Westphalia are suffering from high unemployment already.
The internal balance of EU trade remains unresolved. Brighter minds will have to come up with a new politically palatable resolution to an age old problem.
And the Eurasian dollar has a nice ring to it. I think we are there already, but no currency names have been changed, so as to protect the innocent - or in this case the non-floating one.