It's a bit of a gamble on how they're going to handle the buyout. The announcement was that they'll add the option to all existing leases.
The mischievous side of me wants to know how they're handing the buyout. Based on the current lease terms, I'm leasing the car as if it has a pretty high level of depreciation (~40%?) over the 3 years. If the align the buyout with that assumption then it could be a good proposition for a potential flip in the end. But they might take the chicken way out and allow a buyout at market, in which case you should just dump the car because the cost to lease + full market buyout makes it a really bad deal to own via that route.
Oh nice! 2015 C2S, means you had a 991.1! Very nice car, very fast! Also, the last NA for mere mortals who can't afford GT cars. My 2015 was a vanilla C2, so I was really happy when I jumped in 2018 to the 991.2 C2 with the new twin turbo engine to get to some of that torque. C2S (or GTS) is probably the best trim level... I'm not worthy!!!
M3P torque blows both of my 991's away for 0-60. Pics of my new (M3P) and old (991.2) attached.