[tonfa]

> That alone makes it far removed from being politically suspect in my book, unless there's some blatant case against the euro that I'm missing.

Lack of integration/solidarity. A common currency is a pretty bad idea if economies are allowed to diverge (see previous sovereign debt crisis, there's no reason why eg France can't be the next trigger).

You need a common tax base, and solidarity across member (much more than the current state) to have an effective monetary policy.

The in-between status quo for EU really isn't great (either you need to keep building EU institutions/start having proper eu taxes and budget -- something that is not really popular at the moment--, or euro should be reconsidered). (From what I understand it's not really a controversial opinion in economic circles).