It looks like what needs to change most is consumer expectation for the true cost of dining at sit-down restaurants in their current format. Taking the Applebee's salmon menu item[1][2] as an example and comparing the cost if it were to be replicated in Australia:
Ingredients cost ~USD$11:
In Australia, fresh (never frozen) farmed salmon from Tasmania is $USD29/kg delivered to your doorstep within 24-48hrs of being pulled out of the water. Applebee's salmon menu item[1] looks to have approx 200g serve so that is USD$5.80 for the salmon. Fresh green beans are USD$6/kg (greenhouse as out of season in Australia) and there is probably 100g plated up in Applebee's item, so USD$0.60 for the beans. Premium fresh brushed potatoes are USD$3/kg and there is probably 200g plated up, so another USD$0.60 for the potatoes. Premium fresh asparagus is USD$25/kg (also out of season) and there is perhaps 75g plated up, so another USD$1.90 for asparagus. I've also seen some images of the dish plated up with broccoli instead of beans and asparagus and that is USD$6/kg (also out of season) and assuming 150g plated up, so USD$0.90 for broccoli as a cheaper option. Add two dollars very generously for sundries such as salt, paprika/other spice (not sure what I'm seeing in the photo), olive oil and the slice of lemon. All up, approx. USD$11 for ingredients if you were to make a similar dish at home in Australia. Restaurants generally get better unit pricing from the food service supply chain but the cheaper unit prices of buying in bulk are somewhat offset by increased delivery costs (premium service) and inevitable wastage of buying in bulk.
Typical cost to consumers should be higher than ~USD$36 but is currently ~$USD17 (US including +25% service) or $USD26-30 (AU):
An average food cost percentage for a successful restaurant business (note: still paying minimum or effectively below minimum wage to employees) is 28-35% so picking 30% we end up with this salmon dish needing to have a sale price of USD$36 or AUD$47. Instead, Applebee's are selling that salmon menu item for USD$17 (25% service included) and a salmon dish at a typical restaurant/pub in Australia would be sold for approximately USD$26-30. These sale prices would have to go up higher again to fix the already broken industry with regards to employee treatment and pay (for example, no overtime).
[1] https://www.tripadvisor.com/LocationPhotoDirectLink-g34094-d...
[2] https://www.fastfoodmenuprices.com/applebees-prices/