if they did then I find it unlikely so many people would have died. In SL there are alarm systems along every stretch of coast, and every beach has repeated signs telling you of the tsunami escape route – essentially the nearest high land – so if something happens you know exactly what to do and where to go. They also banned building within 300yards of the coast (although that has been recinded more recently.
You’re right that white collared workers aren’t the best equipped for building work, however a *lot* of jobs in building just require manual labour. things won’t be back to ‘the way they were’ – possibly ever – however that’s how things will start.
its also worth noting that whilst the death toll (current estimate 10,000 people) is high and the damage total, in perspective the impact isn’t huge. For instance, that’s 1/10th of the population of Brighton. Damage was severe, but mostly only in areas right on the coast. Much larger areas would have just suffered some high water damage.