That’s actually a pretty smart strategy, because it can allow Tesla to establish a lot of presence on the market with a relatively small line-up, if they just keep making new changes to the older models and try to keep everything relevant and fresh.
It will take some effort to maintain all of their models like that, but on the other hand, it will also get easier in the long run once the company has released some more models.
Because they can easily learn new tricks with their future releases, and they can apply that knowledge to improve their older models as well. There is a lot that Tesla can do to make the Model S more relevant after they’ve learned what the market does and doesn’t like thanks to the added experience they will get from the Model X, and hopefully we’re going to see that knowledge manifest itself in their next releases soon.
In the end, there are many things that the company does right with their models – they feel truly powerful, especially for electric cars, and Tesla have done a lot to change the public’s perception of electric vehicles towards something more positive. People no longer see these cars as underpowered and weak compared to regular gasoline/diesel powered vehicles, and that’s a huge improvements of its own.