Think some people are having a panic about this.
Next season we'll lose Fulham and Bournemouth, two of the most appealing and smallest allocations.
We may then lose Luton, the smallest, or Middlesbrough which didn't come close to selling out.
We'll lose Peterborough and Barnsley, which we didn't sell out.
We will then gain Burnley (they'll give 3000 in the Championship), Wigan (4000+) and possibly Rotherham (Done many times in recent years and 2500) and MK Dons (8k).
This is before you factor in the loss of appeal next season for new grounds as they've been done. The novelty first season post-covid and back in the Championship and possibly a season where we don't do as well as this year. There will likely be more mid-week away trips, too, because of the World Cup. Are we really going to be taking 1500 away to the likes of Bristol City and Cardiff next season if we are sat in midtable?
There is every chance that next season the points system will not actually be needed outside of a couple of games.
If you want to go to matches, you'll be able to. If you're worried, you may want to consider going to the likes of Barnsley/Middlesbrough/Hull that won't sell out to get your points up.