Here's my input from someone who has been wanting a Tesla from the beginning but is now finally seeing used Model S's come down to a feasible price.
Based on my research (which I'm sure mirrors what many in my position would do), the problem is not desire... we all desire a Tesla greatly. The problem is fear. Fear of owning this vehicle outside of warranty. The MCUs have fundamentally flawed design/software with the eMMC that is designed intentionally to be non-removable and can ONLY be replaced by a remanufactured until from Tesla at a cost of over $3k. The "clunking" sound issue is a very common one requiring a $4k repair that isn't covered by the intentionally named "drive unit" (as opposed to "drive train" warranty). $700 door handles (despite the core problem being simple and inexpensive). The 2012s are going to be getting out of their battery/DU warranty starting next year and given the number of DUs that have been replaced on the average Tesla, the owner can expect at least one $6k repair right there. Oh, and don't even ask about a problem with the battery pack that has a list price more than what the person bought the entire car for.
Very disappointing, but I just don't see how I could ever afford that own a Tesla out of warranty and others will come to the same conclusion. So, what that means is that the overall market for Teslas is going to get worse and worse. I'd expect to see 2012s soon become a "sucker's bet" where there is almost no legitimate market for them... think of trying to sell a high mileage, old, undocumented service Porsche Boxster.
At the same time, the price of NEW Model S's is going to decline over time. Why? Well, not only because of the success of the Model 3, but Tesla provides a full 4 year warranty on their Used sub 50k mile Model S's making it have a warranty equal (minus a few years of battery warranty) to what new ones get. Of course the costs of repairing a Tesla is becoming more well known, so insurance is going to increase as even a minor accident is becoming a "totalled" event.
I'm not trolling. I REALLY want a Model S, the only option would be to get one with a 4 year warranty and sell it before that period is up and that's just crazy.