I don't eat certain things anymore either. That stems from a faith based diet restriction though. Not a moral problem with eating meat.
I think given advances in technology we possibly could find more, but I do not think it would lead to discovering sentience in certain animals. That would would be to subjective. If octopus lived as long as people that would change things. We probably wouldn't be as high on the food chain if they did. Fortunately they don't.
I think today we has people tend to anthropomorphize animals. It alters our perception of them, to a point that could be disadvantageous to us.
This is going to get a little uncomfortable for some, but it is important. It comes down to individuals and choice I think. When it comes to the market end of things.
Individuals should choose if they want to consume something based on all facts presented to them. So if if something is questionable... research it, beyond clips and headlines. Find the facts and go from there. If you choose to continue eating such things after your research... That is your choice. If you choose not to... that is fine too.
If a market demands it, it will continue. If it doesn't it will fade out. Legislation should not be brought into it. That is going to potential stir up more issues that more than likely aren't necessary.
I also think these days science sometimes get politicized... unfortunately. So it will be a difficult thing to figure out.
This is ideally how it should work. Others would disagree.
As long as the animals are treated humanely that is what is important. If they are farmed, treat them well and kill humanely. If animals need to be operated on, give them an anesthetic.
Now the health factor for people is another thing to think about when it comes to food. Is octopus really that safe to eat.
For instance, I seen part of a video were Gordon Ramsay was dealing with live octopus and he bit wear the brain was. Bolting in cattle has shown to spread potentially infectious matter to other areas of the animal. So is there any similar risk... That may not be the best way of dispatching an animal. We don't know what potential neurological problems could come from eating a life form with a complicated nervouse system. Think of bovine spongiform encephalopathy. That is also something to take into consideration.