Few companies are as vertically integrated as Tesla. They make the motors, battery packs, inverters, chargers, etc. They're even planning on designing their own silicon for the autopilot program.
Tesla has revenue from the 2nd gen models to fund their 3rd gen models. Their transition from gas to electric is complete!
I would be happy to see a big car company coming with a compelling competitor to Tesla's vehicles, but thus far there doesn't seem to be anything planned.
I hope to see Toyota produce a compelling BEV in the future. But until then, we'll be stuck with the choice between a used RAV4 EV, or.... the i-Road. They were thinking about offering an electric iQ, but they had designed it to suck, so they changed their minds.
Toyota has said they will try to make more EVs, but the plans don't seem to be very immediate. And there are no guarantees they won't suck.
What makes you think Samsung is number 1? Samsung is the sixth largest battery producer (Panasonic is ~10 times bigger), and their tech is pretty good, but not better than any others near the top.
EV Sales: Batteries June 2016 (Updated) w/ Bus batteries ranking draft
Samsung isn't building a Gigafactory. Tesla/Panasonic will probably produce 30-40 GWh in 2017. Samsung produced 0.34 GWh in the first half of 2016, so maybe 1 GWh for 2017?