Combine the flying parts of a drone with an umbrella, and I Build Stuff is onto something. It doesn’t follow you autonomously, but it would be easy enough to do.
Including some French guys…
Add some lights under it for dark nights, and I think they’ll be really onto something.
They’ll need to solve a few problems: limited battery life (include the regular collapsible handle as backup), needs to be foldable for going into buildings (likely solvable), able to withstand fairly heavy rain/wind (might be hard), probably very noisy (interesting attempts to quiet them, but definitely not a full solution).