I think you just made a better case for having everything in UTC. Instead of having to remember multiple offsets, one for each location, you just need to know your current offset to get a sense of relativity (i.e. "ok, that occurred an hour ago") and the correlation across different locations and sources takes care of itself.
I'm not saying that a log aggregator is not needed, they are still an important of any system as your 3rd paragraph clearly explains, but your 2nd paragraph actually makes the case for keeping everything in UTC regardless.
The concept of "everyone on support" is practiced in a lot of orgs, with varying implmentations (e.g. "one whole day a month", "one whole week per quarter", "one week of half days per quarter"). What works for your company depends a lot on it's current workflows and workload, how long support cases tend to last for. Most mentions of it refer to his post = http://signalvnoise.com/posts/3676-everyone-on-support
No, this is for domains where .worldnic.com is the authorative server. If you registered your name through NetSol but hosted the DNS servers elsewhere then you would just be relying on the respective TLD servers (e.g. .gtld-servers.net for .com domains) to refer resolvers to the correct authorative servers.