The only people going to Mars for the foreseeable future will be those with explicitly useful skills that can only be done in person. The 0.01% are going to be dead weight up there unless they have such a skill. And given it's a one-way ticket... how much social pull will the 0.01% have over the people with actual skills.

You may be a multibillionaire on earth, but being able to sell widgets to the masses isn't a skill that's going to be needed (or appreciated) on Mars for quite a while. Cut off from your wealth, you're just another mouth to feed.

More importantly if the population of earth is facing critical systems collapse, what are the odds of the next critical resupply mission the Mars colony actually launching. It's not like a martian colony would be self sufficient anytime soon.

Can't tell if this was sarcasm or a serious statement.

That depends on whether you have a bunker in New Zealand or not.

New Zealand could be in trouble if ocean acidification happens or weather patterns cause more drought (~80% hydro for energy generation and the arable land relies upon high rainfall).

Can there even be non-localised drought on a small island the size of New Zealand? The only significant geographical feature in the North Island (where most people live) is 3 mountains right in the middle.

New Zealand is small enough that a localized drought can have significant impact. Most of the people do indeed live in the North Island but most of the power is generated in the South Island, particularly around the Mackenzie Basin/Otago area (dry highlands).

https://en.wikipedia.org/wiki/List_of_power_stations_in_New_... - sort the hydroelectric by capacity - most of the major dams are in this area.

New Zealand? Real players build their own islands.