Could say the same about the wright brothers in the early 1900s. Longevity of the flight and safe operation can only improve in time. The question is does anyone care. People will be scared of it and if not does it offer anything over cars? It's not like you can fly it over private property , there will be laws that regulate where you can fly it.
Just give me hyperloop tunnels to overlap subways and freeways and I am set. Especially with better bike lanes.