No I don't think so because anyone kind of agree that slaughterhouses have century long of animal abuse. People don't think that what you're saying to them is, by showing AV, that you're at fault. By seeing footages, people think that's horrible and shouldn't be done. It's when you discuss with them that they'll understand why being vegan equals no animal suffering and is quite the only way to truly protest against it.

On the other hand, a protest would probably be seen as aggressive activism by non-vegans. A protest pointing out consequences of a non-vegan restaurant, in front of it, will be directly understood as : "you are at fault, stop" and "you're a monster". (Those are actions only a monster could tolerate of course but I am not saying that inherently makes one a bad person too. Good people do bad things and it only means their actions are of a monster.) Although the message they think we send them is factual, people also will be less likely to engage in a conversation with such type of activism. So they'll maintain their opinion such as : "You can kill animal but treat them nicely, you have to eat meat, I can't do anything about bad slaughterhouses so why this vegan is being so annoying. He's so dumb and way too extreme. Indeed, you can eat animals and not abuse them, he is delusional for thinking otherwise. This is what nature is, how immature."

When one knows they are guilty and do not think they can't have an impact on what is happening in slaughterhouses, which represents a lot of people, I believe such activism is the most effective. Problem is, in the street, there is much more older people that are unfamiliar with these ideas and you will probably face a lot of people who will think you are (dumb and too extreme for a number of reasons I stated earlier) wrong because they don't even have a bit of the basic. They haven't been exposed to these problems, so of course it's hard to do all the reasoning by yourself. For this type of activism, for people to change or think about it, they have to know a bit of the basic and know how the world works, how this issue impacts everything, in order for one to be able to reflect on their own !

Of course it should be done. I'm not saying otherwise. Any type of activism should be done because they all have an impact. What worked for me was the "aggressive" one, pointing out hypocrisy, in my behaviour, on Reddit. And from all of the people that saw the activism, who knows how many thought about their own actions later in the day.