Ok, what about (...) schotzi (spelling)
If you mean Schatzi; She didn't leave because game was no challenge anymore, but because of real life having a tight grip on her.
And I think she won't be angry about me when I say... she was quite far from being good enough that there was no challenge anymore.

Another thing that comes to my mind: During the last few years, I have seen such a thread every once in a while. The lack of decent 1v1's, and the idea to get another event rolling. Often in the form of a dueling ladder. Sometimes It even gets rolling...just to die after a few weeks.
If there were so many vets that only left because they couldn't find any challenging fights anymore - would't it have been relatively easy for them to meet on a regular base to slug it out in a remote corner of the DA or even in the SEA?
This is a game, and any game can (and almost always will) get boring, no matter what you do.Takes more time for one than for the other. But even when having always an opponent that can give you a hard fight every time, it can get boring.