I think Subaru will skip over hybrid and go directly to EV for mass production and here's why:
First, the
only efficiency that a
non-plug-in Hybrid has, is that it captures BRAKING energy. Aside from that, it's dead weight. For a hybrid, the energy loss from wind resistance can't be recovered by the hybrid system, but the braking energy in city driving is recovered and re-used. That's why the city fuel economy of a Hybrid is greater than it's highway fuel economy. The beauty of this system is that you don't need to worry about plugging it in - you bypass the charging infrastructure issue.
In a hybrid vehicle you have twin powertrains - internal combustion + mechanical drivetrain + electric motor so you have greater complexity not less, and you still have to change the oil, deal with transmission issues, go to the gas station.
In a plug-in hybrid, you have a beefier electric motor, and beefier batteries, but you still also have that internal combustion motor and mechanical drivetrain. Now you need to take advantage of an electric charging infrastructure to fill the battery at home or at an EV station, AND you have to go to the gas station to fill up. Twin primary power sources, twin kinds of fuel needed.
In a pure EV you no longer have to go to the gas station, no longer need to change oil, transmission fluid - it's simpler than any hybrid, more reliable, and you can charge it at home every night. The primary obstacle to mass EV adoption is expensive batteries and this continues to improve. In 5-10 years we will potentially have a battery technology that bypasses today's lithium batteries, not just a few percent improvement, but it could be a game changer but this remains to be seen. The promise is of what they are calling "solid state" batteries. Toyota claims to have them. Subaru is now a part of the Toyota group and they are co-developing their EV. Volkswagen is also getting into solid state batteries. So once the battery nut is cracked, internal combustion engines will no longer make economic sense, even in a hybrid.
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