Has anyone 'against it' ever considered the freedom of choice option of not actually using it?

if they want to add it why not? as long as i don't have to use it.

i wouldn't use it. don't use Steam Wallet either. i have PayPal for everything.

I think in this way the probability to have an empty bank account would even be higher than before because you need to park some money at another place. This should be ineffective. A better way should be to have everything at one place and ask your bank to offer you a small credit limit of say up to 100$ for such cases.

Another way could be to pay by credit card and not balance the credit card immedtialy. As for the future conversion rate, it's quite uncertain how it will develop. The conversion of your local currency towards the dollar could even be more favorable somewhere in the future.

All in all I think that a wallet offers minimal benefit only. Especially I don't see a distinctive advantage. But it adds a lot of inflexibility and sacrifices efficiency. I wouldn't use it, but if GOG likes to offer it, go on but only as purely optional feature.

We got to be living in a different Euro zone, or you're not following news :p
Unless you meant somewhere in a dozen years future ;)

Okay, let's make a game. :)

You tell me if the dollar will be weaker than the euro in one year or the other way around.

That'd be quite another hefty drop (given we're roughly at 1.25 right now), but I'm going to bite.
As I doubt that Japan and the USA are going to be rated properly, I'm going to bet on the equal stance (1/1 rate), despite hope (IF we still have the Euro like it is now by then).

But we are doing so muich fiscal austerity now and the eurozone as a whole has a balanced trade account unlike USA. Shouldn't this help in the long run?

Yes. I feel implementing it would be a waste of GOG's already limited resources though, so I'm against it.

In the long run, yes, I'd say so.
But we're talking ten or even twenty years there (IF the governments are going to stick with that policy, which isn't likely).
As for now, it's not as much a matter of facts, but of opinions and these change slow, even in the financial sector.