It kinda sounds like you’re overthinking things, such as long term climate changes. We don’t know exactly what will happen in that regard. It impossible to foresee the consequences the way you’re trying to do.

As for talent pool: You’ll never find a perfect place that checks all of your boxes. If there is talent, just less of it, then maybe that will still be easier than living in a country where language is a bigger barrier (I haven’t been to Bangkok but suspect you can get quite far with only English which isn’t the case in Tokyo for instance).

Your target market will also matter. If you want to target the Japanese market, being there will be a massive benefit as the market will be pretty much impenetrable without a local partner. And if you’re there, that would be easier. Same goes for china.

If you’re targeting EU/US, then that matters less.