I see what you're getting at, it was perhaps a risky move for them and it could have backfired badly, but I wasn't there at the time and I don't know if they got lots of shit for taking part in Eurovision. If they did, it doesn't appear to have led to long-term damage, perhaps they even managed to widen their appeal beyond the usual metal crowd by doing that. In any case, it's true that at such a young age successful artists are often fragile emotionally and hardships could lead to break-ups or depression... Like for instance, firing Sami was a difficult thing to do for Tuomas, and he went and disbanded Nightwish before someone talked some sense into him. But at the same time, taking risks has also paid off for them in ways that we cannot always calculate. As for the Tarja split, I think it came as a necessity not a choice, at least the way they explained it. After a while, no amount of discussion, negotiation or compromises could make them work together smoothly, and it all had become toxic for everyone involved. I'm not saying that it couldn't have been avoided, had a number of decisions been different, but by 2005 there were probably too many years and too many bad decisions to be able to put things back and to recover innocence lost.