I’ve been giving serious consideration to the sale on now but this morning decided not to move forward due to the problem being encountered with lack of parts to repair these cars.
That's certainly a valid concern. At the end of the day, you know what's best for you, but since you came to the forum for input, I will offer mine.
Parts Availability
After the amount of time you've had your '13 GS, how many parts have you had to replace? I know people don't plan accidents but keep a new GS in "mint condition" like you are currently doing and you shouldn't have any issues. The powertrain is all GM and all of the service items are common across the GM fleet.
Length of Ownership
If you only plan to own a new GS for a few years, you'll still be well within all the warranties, assuming you don't put on tons of miles.
Your Current Ride
I see a lot of the new and previous generation GS's around me and I must say, the last gens still catch my eye. They are a nice, clean, and sporty car. I have never driven one, but since you seem to enjoy it so much, why switch?
Why You SHOULD Switch
You have an opportunity to grab a high feature car right as they are becoming harder to find and right as they're going on sale. The V6 power, true torque vectoring AWD (easily my favorite driving characteristic of the car), adaptive suspension, heated/cooled/massaging seats, heated steering wheel, better UI/Infotainment, utility of the sportback design... I could go on but I am sure you're well aware of all the features. For the money, it's one of the best optioned cars around.
Big Three sedans (sportbacks) are going by the wayside. Are you willing to forgo the performance and additional creature comforts of the new GS for the next 3-4 years? And once your next 3-4 years are up with the '13 GS, what replacement options will you have then?
I don't like playing the "What if?" game, but I wanted to invoke some more thought
🙂 When it comes down to it, I have enjoyed every second of ownership with my GS. I even persuaded a close family member to buy a Sportback Essence (didn't take much convincing). I am confident they will enjoy the car, and I am confident you would enjoy a new GS too.
Drive one and then see how much you'd be willing to stick with the '13.