Turkey is actually very lucky to be a member of NATO. It can rely on its allies if it is attacked.
Its allies will stick up for turkey and the EU especially does try to help Turkey a lot. Also in terms of what Russia is going to do it is all just posturing, Russia's economy is is already weakened and these sanctions against Turkey will hardly make a difference.
Yeah, i can´t imagine that loss of dozens of billions of dollars in business will do much harm to Turkey. Also closed export routes will be great for Turkish exporters. Ballooning costs are always good for business. And since Turkey is an exceptionally stable country as it is, those benefits will only make it even more stable.