A very difficult topic for Liverpool fans, as we all know. As I wasn't at either Hillsborough or Heysel, I'm not qualified to comment about what happened at either - if I had been, I'm pretty sure I would have a different view to the one I'm about to express...
What I know is that I enjoyed standing on terraces when I was younger and would be perfectly happy to do so again - it would allow you to be with all your mates at the match and would improve the atmosphere (and, for me, the enjoyment) tenfold.
However, there is no such thing as completely safe standing, although given that the seat in front of me at Anfield only comes up to my shin, I don't think they're entirely safe either. That said, there is a far better understanding of how to make terraces safer (note - not safe, but safer), hence they have been re-introduced in stadiums like Borussia Dortmund's.
However, it is far more difficult for stadiums to become over-crowded and for large numbers of people to be hurt in all-seater stadiums - though the tragedies in Africa last year were at all-seater stadiums as I recall (please put me right if I'm not).
Then there is the money issue - there is a desire to make football and therefore stadiums more attractive to daytrippers (and make more money!). I can't see many of them wanting to take little Joshua on to a standing terrace for some reason.
There are many other points that are relevant here, but terraces also hark back to the 'bad' old days of hooliganism, the taking of ends and so forth. Given the recent upsurge in violence, it seems even less likely (not that it seemed particularly likely before) that there will be change of political will in the current climate.
I seem to remember Kate Hoey (who was Sports Minister before the latest Blair parrot who has been so invisible I can't even remember his name... Richard something?) speaking out for a return to standing not long ago and then being removed from the job not long after.
A return to standing? Not for a good long while yet, if ever, though I for one wouldn't have a problem with it.