I don't think we need to give up cars entirely, but I also don't think we'll be able to address the negative aspects without some amount of change.

An example: I live roughly 200m from the Costco in the center of town, but there's a major 4 lane road between us. Walking would be so convenient, but it's so much safer to drive. A footbridge would address this without impacting drivers. I have no intentions of giving up my car, but this particular activity would be so much nicer without it!

The simple geometry problem of how much space cars take up is arguably the worst now (given tailpipe emissions are on their way out), and there is no solution to that outside of fewer and much smaller cars.