200% is hardly dumping.
Demand is only an estimate, and it's not an estimate at lower than standard cost or perfect CI/RI. With 100 RI and 100 CI and low enough pricing, it is possible to achieve up to 150% of the estimated demand on a route. You can run planes in excess of 90% LF, quite profitably, even approaching 150% of demand. So 200% is hardly excessive or anti-competitive.
And one big consideration is that, as a result of 9/11, demand plumetted in-game. What was once a perfectly reasonable 125-150% of demand on a route, is now over 200% of demand due to the fact that demand has fallen. I've got more than a few routes that I've got that much demand on, and there's not even anyone else on the route for me to be dumping on, it's just the way things turned out here recently with the demand rop.
If he can, and he has a need elsewhere, he might move those now-excessive planes to newer routes. Or he may just decide to wait out the demand drop if he's got the cash. I've noticed his financial growth seems to have slowed recently, and the demand drop probably hasn't helped matters. The upcoming fuel costs skyrocketing won't help either. He'll either make it just fine, proving his strategy is viable or, like many others have in the past year, he'll bankrupt and you'll be able to capitalize.
And I would have to completely disagree that it's "basically impossible" to start a game right now. Countless major US airports have little competition, particularly due to bankruptcies and/or simple quits in the past year. Probably 3/4 of the largest airlines in the game have BK'd or quite in the past year, leaving huge gaps in supply. I can't speak for European or Asian airports as I'm not checking any this game, but I have to assume the situation is somewhat similar there.
Hell, Chicago O'Hare sat completely empty for almost 2 game-years with almost every route to it completely open -- which if you look at my Route Map you can see I certainly capitalized on. Only recently did an airline start there but there's plenty of room for another, as there are still countless major routes available.
Air Love, which was a Top 5 airline, recently BK'd leaving IAH completely open (he's just started over, but still very small).
Yankee out of DFW, a Top 10 airline, was driven into bankruptcy, leaving me there alone -- I've got hundreds of flights to locations over 250/day that I still don't even fly to yet and likely never will and well over half the slots still available, leaving plenty of room for another.
I think there were 3-4 major top airlines out of ATL -- now there's just a single one, with plenty of demand and slots.
SEA is completely open with only 2 tiny (1-2 plane) airlines there.
PDX is completely open.
MSP is only home to a couple small airlines.
And so on, and so on.