It's interesting that in the early days of the automobile, electric, steam, and gas cars were all vying for supremacy. There wasn't a gas station infrastructure, and folks weren't keen on the combustibility of a tank of gas in your car. Gasoline eventually won out, of course, because of the extended range you could get. It was crank-and-go, rather than waiting for a steam boiler to heat up. And battery technology wasn't obviously up to snuff for anything other than city car use. But you'd be surprised how good they were back in ~1909. Check out Jay Leno's 1909 Baker Electric:
https://www.youtube.com/watch?v=OhnjMdzGusc
Now, of course, we have a gas station every 3 miles, so gas is tough to beat. Hybrids are only a stop-gap measure, because battery technology, for the most part, hasn't been able to meet the average user's requirements. But we're getting to the point where they are. Teslas have a 200-mile range. I went for a long drive (in the car) in the country last weekend, rambling for 4 hours and 170 miles. I could have done that long meander in a Tesla. I think Chevy's new Bolt has a similar range. I have a friend who has a Nissan Leaf and loved it. I think that had more of a 100-130mile range. We have a chain of Walmart-like stores here in Michigan called Meijer (pronounced Meyer). Many of them have Tesla charging stations at them now. All-electric cars are closer to being viable for the average driver.
The problem with hybrids and motorcycles is that hybrids need space for 2 drivetrains. And they're heavier than a comparable gas-only vehicle. Note that the PCX has its helmet storage area in the forward area of the seat. It looks to me like the battery is above the rear wheel. That could be a negative in terms of handling, and in the overall weight capacity of the bike.
A hybrid motorcycle will be for a niche market only, those who want the cool new technology. Sure 130mpg is great. But few of us are complaining, "gee, I really need a new bike because my NT gets only 50-55mpg......"