Sphaero
Struggling to explain his genius to the hoi polloi
Hummels won't push for a move and I doubt Dortmund will sell.
Sokratis and Subotic are two fantastic centre-backs anyway so I'm not sure why there'd be reluctance if a big enough bid came in. Personally I'd take any of the 3 at United.
Neither can fill Hummels´ role on the pitch as one of the dominant build up players (Ginter might with time, but certainly not next season) and Hummels is way more than a CB or even player for Dortmund. He is the most important and hardest to replace playing person we have.
The transfer of Ginter is about adding depth in the defense and a preparation for the possible case of Hummels´ someday deciding to leave Dortmund. We would be pushing way harder on the Ginter matter and look also into multiple other CB options if Hummels would have communicated his desire to leave for a certain price. This is not happening and would be highly uncommon for the work of Watzke/Zorc and Klopp, especially given the latters well known preference of sorting out transfer business early and having all players as soon as possible for the Pre Season.