ekajuan I get the money thing. Even with as cheap as Construct 2 is, it can still be hard to come by for some people. With that said though, if you are seriously into the software and have the financial ability to get C2 now, or in the near future, I would go ahead and do it. C3 is still a ways off. You can get started with C2 and learn it. And better still, you can sell your creations from C2 and earn the money for C3. You'll have the time to do that.
What you say, regarding the currency conversion rate, makes sense to. If it's weakening, and you have the ability to buy C2 now, it makes more sense financially to do it now.