I think that Disney is waiting to see the booking numbers for 2020 and gauge the Galaxy's Edge effect before releasing an discounts. Disney is about making money above anything else, however, they are not stupid and have to meet shareholders expectations and Galaxy's Edge is not going to pull the numbers that warrant no discounts. People simply will skip.
Disneyland has a good indicator of what can happen. I don't Disney will play with low attendance in 2020 - we may not see
Free Dining but there will be discounts. Hollywood Studios can not absorb the over flow that Disneyland can. People are not willing to wait and the whole new Tier system already has many rethinking even going to HS. Again, I think Disney is waiting to see the response before releasing any discounts.