I'm sure they're eventually going to impose the point-related penalties for kicking members or having members leave, which in itself should stop the entire act of temporary guilds and temporary members

I like it that way because people can still have guilds that are specific for something, like if you want to make a GS guild or a PK guild that recruits people temporarily then you still can, it's just that your guild will never benefit from it through points so you'll have to be doing it just for fun and you'll never really be rewarded (which is probably going to discourage 90% from doing it)

For example, if you have a guild that functions naturally as a spar guild and your intention is to spar actively and win GSTs, a point penalty is going to completely discourage you from recruiting temporary members to increase your GS score because kicking them will penalize you for more points than it's even worth
If you have a tag that's just a throwaway GS tag that you want to GS on, you don't really care about the points associated to that guild so you can still do it

Then when/if things like tower and GST rewards are transitioned over and redeemable through points, everyone is going to want to get points so it basically fixes the problem without actually forcing people to do it