Insurance question - umbrella policy

My friend addressed in another e mail (I think it must be slow at the office today)

Yes they don’t have squat now, but that does not mean there are not conseqences to getting a large judgement against you. Using the California example above, an judgment at 17 could hang around until the “teenager” is 37.
If you aren’t cash poor, I think it is a good idea. YMMV