Historically disasters (and wars) have the opposite effect. In the short term it's terrible, but long term a disaster usually spurs rebuilding and economic activity that results in a better situation than what was there before.
Pretty ridiculous statement in my opinion. Life goes on, disaster or not. There's supposedly always better situation in the future, it is pretty dubious to claim that wars and cataclysms accelerate long term development.
It depends on what you mean. Wars have historically accelerated technology development, at least in the short term.
If you mean development more generally, then no probably not. The civilian technology would eventually get developped, if more slowly without the major push of a war. In the process, people and resources are destroyed.