Not only more options, but the competition will probably drive down the Model S prices, I would think. When the Roadsters were sold, they were super-niche for those who could afford them, and they helped finance the Model S design and production, and the Model S is now financing the Model 3 and the Superchargers. With apples-to-apples competition, I would expect that instead of the Model S being overpriced to help finance those things, I hope that we're instead going to see more competitive pricing.
That being said, I truly have no idea what the profit margins are on Teslas or any other high-end luxury sedans. Maybe everybody makes a killing in the high-end market...??
Tesla should have an enormous advantage here, as long as they're successful at getting the cost of the batteries down and the volumes up. And driving up volume is a major part of getting the battery costs down.
The Tesla is a vastly simpler car to design and to build than a standard luxury car and (batteries aside) it should also be significantly cheaper. Instead of thousands of individually machined and heat treated mechanical components, you've got one or two dirt-simple AC gearmotors/inverters and a bunch of electronics & software.
As far as I know, raw materials are a relatively small part of the cost of the batteries. Most of the costs are in the manufacturing side - in the labour & equipment required to build the batteries & components. Industry has in incredible track record of incrementally driving down those sorts of costs every year as they incrementally figure out simpler and more automated ways to build these things. The "gigafactory" should go a long way towards this.
I suspect that industry is concerned about Tesla, not just because of their technology, but because their basic vehicle design is conducive to dramatic reductions in manufacturing cost, in a way that is simply not possible with ICE powered vehicles. There is no basic reason why a Tesla style vehicle can't be far less costly than a conventional vehicle.
On the downside, it will eventually take the "art" out of vehicle propulsion systems. There is a sexiness to turbochargers, cam designs, exhaust tuning, electronic ignitions and timing, and all of the fine complexities needed to make the most out of an internal combustion engine. In 20 years, once the design of the electric vehicle "skateboard" base has been more fully refined, there's not so much to do. Electric motors just aren't that complex, and the opportunities for improvement are far less. Vehicle design will be all about the cosmetics & features, and no longer about the design of the drive system.
My 2 cents anyway.