Gas prices are about $1/gallon higher than they were when the Model 3 was unveiled and Tesla got a huge backlog of orders. That's about $5000 in additional gas savings over the life of the vehicle (some of that in the form of residual used value). OPEC is still cutting back, and they want oil at about $80/barrel, up from the current ~$65. Gas prices arguably still haven't reached equilibrium for the current price of oil, and continued under-investment in oil capacity during the last slump could lead to significantly higher oil prices going forward, particularly if the global economy stays fairly strong. This is incredibly good for Tesla.
So I think Tesla has more going for it than a lot of people give credit. Theoretically, other car makers could've switched to electric tech, too (it's fairly simple, although it takes investment), but just about the only car makers who are TRULY serious about it (versus talking about it) are in China. Certainly when compared to other domestic car makers.
[0] http://www.businessinsider.com/300-oil-is-not-impossible-say...