Nuclear waste isn't a one-ness though, that's high-level waste, the end-product of fission and reprocessing. Long half-life daughter nuclides. There's lots of other stuff, low-and-mid level for instance which can anything from a pair of gloves to filing cabinets. Anything that's been potentially contaminated with radioactive materials generally falls into this category, even if it's sub-kBq and short half-life like 32-P (which is better stored for a couple of months and then disposed of in a normal bin). That kind of stuff could and should be better categorized. There's also big stuff, reactor vessel walls etc. which are generally very radioactive and difficult to manage. I do often see it stated that the fabled fusion doesn't produce radioactive waste, which isn't really true, since most forms of fusion will kick out high eV neutrons into the reactor walls and other equipment (only 3-He fusion won't, but that has a massive Coulomb barrier to clamber over, far, far higher than our current tentative attempts with 2-H and 4-He).
Anyway, we're a ways away from fusion-powered cars, that's right back to the future. But anyway, a society with fewer cars would be better in my opinion, and electric cars simple perpetuate the unsatisfactory current situation (no one seems able to state any genuine benefits to our current dependency on cars), as would nuclear-powered cars. Admittedly nuclear-powered cars would be cooler, if not literally.