Might and Magic: Duel of Champions

What do high initial sales and subsequent low sales indicate? That the gaming community showed considerable interest in Heroes 6.

No. It shows that Ubisoft is doing a good job with its marketing. It's the only department that's working effectively: even the beta version raised some concerns, but they managed to convince fans that it would be a great game + a new installment in the series + beautiful graphics. So, people bought it. And were horrified.

I hope Ubisoft understands that to "milk money" from players, they need to improve the game's quality.

Quite the opposite. They released Clash, now there are card duels, and next they'll launch some kind of browser game or online nonsense, and they'll get away with it thanks to the same marketing. It'll be like, "new and beautiful."

But all the Factions in M&MDoC are based exclusively on the Factions from Heroes 6. Therefore, to keep M&MDoC alive, it's necessary to release new Factions in Heroes 6.

Really? On the contrary, by introducing new monsters, primarily in the duels, they can spark some interest in them in the main game, Heroes 6. Because the same principle will work again: beautiful visuals + marketing.