It doesn't matter if the few people who don't get over it, abandon rail and drive. The fact is that the 700s are designed to move the maximum number of passengers safely in the peak on routes where the train frequency is already near or at maximum that the infrastructure can reliably handle.
In order to achieve that, less than 7% of seats have been sacrificed to prevent the expected growth regularly leaving passengers unable to even board the trains.
That seems like a reasonable way ahead to me, but of course there are always some for whom the microclimate of their personal commute may not suit them in the future. The roads await them if they can't get over the sheer inhumanity of standing on a train. Their absence in the future will not even be detectable with the expected growth in rail travel but the worsening state of the roads may well cause them to rethink their change after a while.
im not sure standing in general is seen as inhumane...... i think its more the point that the service is getting worse. Having less seats and standing now when you previously could get a seat is regression, not progression ( i know there will possibly be a couple of extra TL trains than their are southern trains earlier and later in the morning thus actually an overall increase in seats, but this isnt the point)..
I can't see how when fares continue to rise that passengers should just accept regression.
It also needs to be asked how long should people expect to stand for?. The Littlehampton services will be a bigger issue on this.