Unless you have some "weird-kinda-graphics-card," I've never seen a graphics card for which the fan didn't force air onto the board. And you're board doesn't look very "prodigious," unless it's one of those new Maxwell short cards. And in that case, no, I wouldn't worry about heat from your graphics card causing a problem with your PSU.
But returning to your thoughts or speculations about a more powerful graphics card. The answer there should also be "no." NOt to worry.
For instance, I've got this GTX 780. Two fans suck case-interior air to blow onto the heatpipes and fins of the 780, and a good portion of that air is forced out the rear of the PCI plate. Those cards require two PCI slots, and the double-sized plate has a vent for exhaust.
I hope you're not like me old Moms. If I had a penny for every worry she invents for herself (and others) in a day's time, I'd be Bill Gates and Carlos Slim in a month. Of course it's worse if they're 90 -- going on age 3. They can justify their myriad worries about everything else because they have an overall reason to worry in general.