A tank of gas costs me currently about $20-$25 (Prius) while a recent ride for roughly 13-15 minutes cost me about $20 which definitely doesn't outweigh the value of owning a car trip wise.
Additionally it ignores the overall convenience of owning a car for transporting things like grocery, etc...
As someone who does use Uber and Lyft on several occasions, it's at best a supplementary service for my needs and as I'd imagine, many others