I think the main issue was the price. I mean what is a half sized city car that fits only one person worth to you? No sportiness involved?
I think $15k is about as much you can go and generate any wide appeal. $19k was a bit too much.
The red one around here is still on the roads.
I read a study about 7 or 8 years ago covering all non essential personal use vehicles, and at the time, $15,000 (not purchase price, but purchase and costs over 1 year) was the point where sales dramatically dropped off, be it motorcycles, kit planes, kit cars, snowmobiles, jetskis etc.