My idea is simply to keep old dungeons going and buy gaining something out of it.

For example it would be something like this.
Daily - weekly whatever you want this to be setup like.

You do 3-4 dungeons to complete the task and you get some MGP.
Sastasha > The Tam-Tara Deepcroft > Copperbell Mines > Halatali

Once all done you get like 500-1000 MGP
Each day or week whatever you choose is different, it doesn't need to be in order.
Dungeons could be random orders and not just those dungeons I named.

Put new stuff in Golden Saucer that will be a lot of points to get but if people want them they will have to do these dungeons.
If not then it will take a bit longer the normal way.

Though could help a lot with dungeons being done without wait times.