I don't want to water down the enthusiasm but I don't see how it can be an export success. You won't see Germans, French, Italians etc. lining up for a Turkish car unless it's cheaper than its European counterparts and Tesla. But if someone is considering of buying a non-western(I'm including SK and Japanese into this) automobile solely on price-point, then they will also look into Chinese car manufacturers. At that point you're competing with the Chinese giants. Therefore, I don't think it will have much success in Europe apart from the Turks who's living there.
I think the real value of TOGG will be the ecosystem it's trying to create in Turkey. If enough demand is created, TOGG can incubate tens, if not hundreds, of suppliers for various electric-car specific parts. And when those suppliers are matured enough, they could start supplying the Europe and the US and could capture big slices of the pie like TEI does with GE but to a much greater extent. Having said that, there are, ofc, many more things to be gained from TOGG initiative(like localization of battery cell production, planning and setting up a mass-production line, software, university-sector collaboration, bringing up highly-qualified work force etc. to name a few).