I have a 2013 p85+ that I special ordered. It only has 16,000 miles on it, and has been flawless. My dilemma is do I sell it and get the P100D. From what I can tell, my $125K car is only worth around $65K now. To replace it with the P100D it is about a $150K. The dilemma is what is the the net gain for an additional $85K. I am wondering what is the future of older Teslas. Is there going to be a hardware upgrade, battery upgrade and other components to increase their value? It would be nice to know if there is a future plan for older Teslas. Once you have owned a Tesla, no other car seems adequate. Anybody facing this dilemma? Thoughts?