Let's get back to the subject in hand...
...can we make the Prius non-existent?
I hope you don't need this pointed out to you but your comments would indicate that an important consideration has escaped your notice. The Prius is an inanimate object (like a gun) and therefore it must be noted that Prius cars do not go slow in any lane -- their drivers do.
Are you assuming that those drivers would change their habits if they owned a different car?
Out here in cowboy country, the worst offenders are the geezers who always drive slow on business corridors as if they were in a parade. They will drive the entire length of Patterson Ave. in the fast lane at 25 - 30 mph. If you want to take advantage of the 35 mph limit (some stretches 45) you'll have to pass him on the right. This is 2 or 3 lanes in each direction for about 10 miles. I think getting stuck behind one of these anachronistic yahoos would piss you off just as much as a Prius does.
In order to grasp what has happened with the Prius, you should recognize this: It's announcement was heavy with foreboding for the oil companies, domestic car manufacturers and other unspecified entities. In response, they lobbied their media puppets to generate doubt about the merits of the Prius years before they became common on our streets. Low info types ( Bose buyers) of the world adopted and repeated these fallacies as if they had some knowledge the rest of us were missing. Net result is the bias you have in your mind now. This whole thread is a testimony to the effectiveness of their efforts. In much the same way, I encounter negatives about horn based loudspeakers because of reviews in High Fidelity magazine and Stereo Review 35 years ago. If something can be implanted via sufficient repetition, it may well become common knowledge ............. even though it is dead wrong.