Been vomiting about it for a long time, especially when in the next breath we're told the health system is "under strain" or "at capacity".
Refusing citizens to board flights back home because they "test positive" to a virus that 90% of the country is vaccinated against (and subsequently abandoning them in a foreign country potentially without a valid visa) is simply not sustainable, let alone reasonable. I suspect it simply hasn't been very well thought out as yet. We were able to ignore it when it was only "rich expats" being refused boarding onto their $10,000 one way tickets home, but when Bazza is stuck at Nadi airport for months on end, somebody will take notice.
I can't see that happening - the most someone should be in another country for is around 2 or so weeks - assuming they are fully vaccinated as a condition of entry to that country. There may be the odd outlier where a fully vaccinated person still needs an extended stay in hospital... but that's no different to any other medical emergency now. I doubt visa expiry will be an issue with covid anymore than it is with other medical issues?
Travel insurance will cover any extended stays or repatriation - so no one will be stranded. Some countries have it as a condition of entry - this may become widespread.