Here's the names of the 8 drilling rigs that have left the Gulf since the Moratorium was put in place. To note:* 1 was already scheduled to depart for another area
* 3 were new, 5 were more than 24 years old, and some were more than 30 years old. 20 years is generally a good lifetime for a rig; 30 is sometimes done if prices are favorable and there's been good maintenance and 10-year overhauls. The new rigs will hurt (the 3 that left were among the best in their respective fleets), but the others were so long in the tooth, you'd almost say good riddance. Diamond had a lot of legacy drillships left over from New Orleans-based OEDECO that probably shouldn't be operating in the second decade of the 21st Century. They'll eventually be replaced by newbuilds very soon. There's a MODU building boom going on in Korea, thanks mostly to generous government subsidies and financing for customers.
The worrying about "Economic Survival" seems to be past, but the Moratorium may yet teach us some interesting things about drillship construction and BP's operating practices.