Safe standing should come back and will eventually.
In all honesty, I also fail to see why Hillsborough is used as an example in this? Hillsborough was not caused by fans standing but terrible policing which lead to too many people being directed into one pen, rather than spread across the stand. If the police had done their job correctly and also not opened that gate, it would not have happened.
Safe standing would remove the very unsafe practice of people standing in full seater stadiums. Also, given with safe standing everyone still has a ticketed 'standing area/seat' it would be impossible for a situation similar to Hillsborough to arise.
Emotive a subject as Hillsborough is, it shouldn't mean we are unable to explore safe standing. If the majority of football fans want it back and, once explored, it is deemed safe, then it should be brought back.