I don’t think nail salons will dissapear. High end salons that also do nails will, yes. But those “in/out” shops that do your nails for $6 will thrive. The people who were spending $70 a month on their nails will downgrade. Manicures are like lipsticks. In a recession, lipsitck sales go up because women are cutting back on luxuries but will treat themselves to a >$5 new lipstick. Women will stop coloring their hair but they will treat themselves to a $6 manicure.
Sign spinners must be a west coast thing. I don’t know what they are so I don’t think we have them out here on the east coast.