Patience, people, patience. TfL have said they have added the junction to their list for further consideration, and they recognise that there are multiple issues here. There is no reason to suppose they won't come up with an improved scheme which allows pedestrians to cross all at once. Indeed, as I said upthread, they are implementing just such systems elsewhere, with an all-stop phase against the traffic to allow pedestrians to cross in all directions unimpeded. However, that demands a redesign of traffic lights and road layout at an important junction on a major route. These things take time.