Definitely, my depreciation over three years has been £300/month, add £30/month more for insurance. The salary sacrifice through my employer would have costed my twice that monthly.With high resale values currently and with Tesla, purchasing out right seems to be the best cost effective way to own a Tesla, yes resale values are higher now but I expect this to continue for a while. I don't have any example numbers but I suspect over the past 3 years salary sacrifice and lease options will have cost more than someone who personally financed the cars and then sold it. In this respect the higher purchase price is likely to have an effect on organic sales for the car, Tesla know this and is just one of their methods to manage their sales.
For those that do decide to lease/salary sacrifice then I suspect the monthly price changes will probably not make a huge difference compared to the saving in fuel as you mentioned.
Clearly it's always going to be more expensive as lease companies that don't make profit tend to not last very long.