I dont think you have anything to worry about. The 370 platform is hitting on 10 years old and Nissan is showing no signs of shutting down production. Even if they do stop, i think you will be good for another 8 - 10 years before getting OEM parts is an issue, and even after that, aftermarket stuff will be around probably long past the length of time you will own the car.
Look at the 350Z platform. You can still buy brand new parts for that car and aftermarket builds from other retailers and the thing has been around since early 2000’s!
Enjoy the car and drive it hard! If something breaks i can assure you that finding the replacement part wont be an issue.
__________________
2009 370z M/T - straight pipe cut outs / motordyne test pipes & intake manifold / K&N typhoon intake / ACT stage 2 race clutch & flywheel / ZEX wet nitrous / UpRev tune / stillen race oil cooler / 317 WHP N/A - 381 WHP with ZEX
www.youtube.com/danialk ///\\\///\\\ Follow me on Instagram @dankobra