I actually think there's almost no possibility that Blizzard will make another RTs after LotV let alone WC4. RTS games are just not as profitable anymore. It playerbase is small and its gameplay goes against everything developers should aim for in this modern age. Today, players want accessible game. MOBA games are the form of RTS that answer the need of modern gamers. Look at SC2 for example, it's an incredible game. It is the fastest selling RTS game of all time but its sell pales in comparision to games like CoD,WoW,D3 despite how costly it is to make a great RTS like SC2. Blizzard couldn't even sell skins in SC2 because it will cause a problem in gameplay. Gamers these day don't appreciate RTS game. It's quite sad really.