Originally, the Prius was a hybrid because Toyota and Honda thought that was what buyers wanted. But the buyers converted the hybrids to plug-ins. So, Prius became a plug-in. Its not clear to me whether or nor Prius still makes the original Prius hybrid.
As near as what I can tell, the buyers want a 40 mile range in the electric mode for their daily commute and running errands, after which, if needed, they can fall back on the ICE.
OTOH, Musk seems to think an all electric with a 150-200 mile range for under $35,000(Tesla Model 3) will sell.
Hold on there, I'm a big plug-in fan but we need to make sure we keep the facts straight. The original Prius began sales in the U.S. in 2000 and the plug-in Prius began sales in 2012. In August, there were 818 plug-in Prius sold and 22,619 non-plug-in Prius sold.
“A few hundred” are believed to have converted their non-plug-in Prius to a plug-in.