The 777 is more limited on ULR flights than a 744. The 77X costs close to half a billion dollars a piece, a wee bit more than a 380. Airlines do not seem keen to drop this amount of coin on a new aeroplane as financing that amount of debt makes getting a bonus for huge profit hard to achieve.
Smaller aeroplanes are cheaper to purchase, cheaper to operate and easier to manage when times are hard.
Unless the purchase price of the 380 and 77X are reduced substantially, I doubt and large orders are going to be made soon.