Why do you think a "mild" variant would trigger any measures?
Your reaction is rather panicky. As I said on another thread, Omicron might well be our way out. Early medical analysis from South Africa shows it to be very infectious but giving mild symptoms and then offering good immunity to other variants. It almost appears to be a natural vaccine. This has happened with previous virus outbreaks. But it is too early to say, so I think caution is merited. So instead of urging people to drop what are quite minor inconveniences (mask wearing on public transport, vaccination, etc.) perhaps we just need to show a bit of backbone and let the boffins do the boffining.