The MGTF is being reproduced, driving used to be fun.
It is possible to build a small car that will haul the kids, but there is no profit in it.
General Motors was long ago bought by the suppliers, Steel, Paint, Plastic, so design uses as much as possible.
Europe and Asia have moved to injection molded parts, turned out some cheap small cars that will last.
The second problem, if they last, we need less.
I have a design for a very low cost yet long term vehicle. I like my avatar, from 1955 to 1968, most of the parts are the same. Only the engines differ.
Many got a million kilometers off the first engine.
It will happen, it won't be coming from Detroit.