I think that if the South Stand is going to be a no-go for ticket holders from other areas of the ground, then a fair percentage people will use the bars in the East Stand. However, this really wasn't made clear in advance and the employees manning the barricades weren't expecting it, had little idea what was going on and most didn't deal with it particularly well.
The South Stand area was sold as THE place to be post-game and whether specifically stated or by implication, a lot of people (myself included) thought that there was free movement within the stadium, for that to be shown not to be the case and pretty bluntly at that, wasn't a great start. If you tell people well in advance, there's unlikely to be a problem but springing it on people last minute is a recipe to upset your customer base.
I'll happily have a beer in the East Stand but without free movement, it will be without certain friends and family, which is a shame. If numbers preclude it as a possibility, then that's fair enough.
Perhaps for such scenarios they could do a post-match :
- Leave the south stand facilities to go elsewhere but you
cannot return when congestion is deemed to be high
- Any stand X to stand Y movement is allowed, except for Y = south.
I trust that something amenable and productive can be worked out.