Eliminating lone seats would be a game changer, only requires shifting supporters along a few seats.
Many casuals would be put off going since the majority of areas are just single seats and can't go with friends and family.
If you shifted to the centre of entire stand, that leaves the edges of stands for casuals.Most you'd think wouldn't care as they'd be given a slightly better view.
Then when selecting tickets to purchase on a given game, it automatically gives you the innermost seat of a specific row, so that you can't leave a 1 seat gap.
One for the supporters panel maybe?
As someone who can only make a few games in a season, I'd be fine with only being able to sit on the end of the stand if it means being able to go witof unsold seats for casuals who go h friends/family. Alas normally I end up going on my ones because it's usually last minute if I can make it to the match or not and miss out on the initial ticket sales.