There doesn't need to be a problem. These trains stop at Lewes so can easily accomodate more passengers than for example the one last night. It's all about organisation and sad to say there does not appear to be a senior steward involved to instruct, so it ends up chaotic and frustrating for fans.
Re: Evening games I travel to Lewes by train. Across the bridge and then onto the slipway there are two lanes, one is used for the lame and for escorted kids, so its already in place, the other for everyone else.
It works, well almost, as the lame lane should include those travelling to Victoria...