Even at the moment the loads aren't that good on the 2 existing direct routes
Don't know what kind of loads you are expecting but I would think AA and UA are happy enough with between 86% and 90% loads in March assuming both routes operated daily? Last August it was between 93% and 96%.
Just because you think it's poor onboard service on TCX doesn't mean that no-one will bother altering their their travel plans. Others may be perfectly happy with it and if they are used to travelling on TCX then they may choose to go with them rather than travel south to travel west.