My wife was telling me yesterday that she read they are contemplating leaving them in place until October, when the monsoon season ends. I sure hope that is not the case. Granted, they are taking them supplies, but I think being stuck there for that length of time could result in disastrous consequences.
After this tragedy, what choice do they have? Having the boys cave dive would be incredibly dangerous. In the meantime, they already have air, they can get them water purifiers, food, and (minimal) shelter. They should be able to survive there for 3 - 4 months and then walk out when the rains end.
It's not a great solution, but it may be the least bad one.