Think it's more like 200 miles from Copenhagen to Kalmar by road. I visit a factory in Ahus fairly regularly, which is about half way between Copenhagen and Kalmar. No idea if there's a train. It's mostly single carriageway after you get into Sweden and it can be fairly slow going.
The hotel I usually stay in is around £120/night with breakfast and dinner and is nothing special. I think beers are around Kr50-60 for a half litre, so 5 or 6 quid. I'll do a more extensive study next time I go.
Interesting topic. I think that there will inevitably be a decline in triathlon at some point. Other sports that have gone through the same rapid boom have gone backwards eventually. Golf in the 80's had a similar level of, for want of a better word, "fashionability", and the proliferation of golf courses and popularity during that time is starting to reverse. There will no doubt be another "fastest growing sport in the World" along at some point.
For me, what Dreaming of Magic said is about right. Triathlon allows me to mix up my training, and as someone who gets easily bored with doing one thing that's the biggest bonus. If I'm honest with myself I only race to give me a target to train towards.