The Prius isn't even that good at using gasoline. I used one as a company car quite a bit in my last job, it averaged 50mpg-ish. I can get that in my non-hybrid Honda Jazz, which also has better visibility and cleverer use of space. And a modern common rail diesel can do considerably better, albeit with horrendous repair costs if / when the injectors fail. (But what does a spare Prius main battery go for these days?...)
If your driving was purely urban, your Prius would beat your Jazz (called the Fit in North America, BTW) handily. Yes, the Fit/Jazz is extremely space efficient, but it is still quite a bit smaller than a Prius. There are certain uses in which a hybrid beats everything. Diesel is the same way - long distance motorway speed, optionally with a heavy load to carry. But getting a diesel to meet anything more than basic emissions requirements has made them very complicated and expensive, with high maintenance and repair bills on top of that. Financially, they make less sense than they used to, especially now that the small turbocharged gasoline engines are available fairly cheaply.
As for electric cars, well, once Tesla's gigafactory is running at full capacity, Tesla will be able to build enough cars to grab an approximately 0.5% worldwide market share. It's a drop in the bucket. Now, slice that battery pack up into 10 or 15 pieces and install them into some plug-in hybrid cars with small turbo gasoline engines, and you have all the makings of a company that can compete with BMW and Mercedes Benz.