Dalot - Yoro - Martinez - Shaw: this is the strongest combination Utd currently have.
Personally, I think Luke Shaw is completely unreliable, and should have been upgraded/replaced 5-6 years ago, so it's remarkable that he's managed 10 seasons in a row as Utd's first choice left back (notwithstanding the Mourinho/Ashley Young days).
I truly belive that Utd need two high-profile, best-in-the-world, full backs. A £70m right back and a £70m left back are both necessary, as well as £35m back ups for each.
Wan-Bissaka, Dalot, Shaw and Malacia need to be all targeted for replacement/club exits in the next 12 months (next 2 if we're lucky).
Essentally it boils down to this - not one player currently at Utd is, in any way, likely to still be here and part of an ultimately successful team (win the league/champions league) at any point. So, we know that they all have to be replaced. The question is - how fast can it be done?
Tyler Malacia was the first guy that Ten Hag bought when he took the job. Once we get to the stage where he's gone, and everyone at the club before he arrived is gone - then we'll know we've made progress (of course, all the guys who came in after him, such as Casemiro, Anthony, Mount, Erikson, etc. need to go too).
We'll get there - it just needs a complete "Ship of Theseus" revamp of the club (as in... every single person, at every single position, in the club is replaced... and fast!).