Same as now (about 20% of a health chunk)
Slightly more than now (about 33% of a health chunk)
A lot more than now, so they are a threat (about 50% of a health chunk)
I would personally like to see them matter more as well. Currently they have basically no bearing on the match beyond filling out an area with fodder enemies to farm. It seems they also largely ignore you when you stand in the middle of a swarm of them, like a Dynasty Warriors game. It would be nice if there was more tactical consideration to take in killing them beyond just for the purposes of capturing B. It would be great for instance to be in a losing duel in B, then having a wave of friendly reinforcements crash in and save your skin while you fall back to safety. This would also give more utility to the arrow storm and catapult abilities that we've seen in previous videos other than just as something to target other players with.
At first I thought they'd need to attack the players a bit more often but after seeing a bunch of videos it seems they are aggressive enough. When surrounded by five or six of them your health will visibly decrease a bit, but not by much. Even if staying in the front for too long means you'll lose a little bit of health that could make a difference against fresh enemy players I think they should have a very very very slight damage buff, just so that it's worth your while to block their attacks when they're in groups instead of taking them like it's nothing.
I personally would like to see those minions in actions as well, but not like they should matter. For now, they do enough damage.
But my idea is that rather than make the minions do more damage, to introduce another(or other two) types of minions that look slightly different than the most of them and those to do a little more damage, but also to be more rare than the normal minion you find on the battlefield. Although fighting at B might not be that simple as it was until now, you will be able to distinguish between the minions that do almost no harm and those that can damage your health if you get surrounded by them.
The pros seem to be fine with the way it is now, so who am i to disagree.
From a streamviewers perspective i'd like to have a little damage added which makes blocking against them viable (just holding down the button, no directional defense). It is a little strange to see the chars roaming freely in the enemiy food soldiers lines without a little penalty. I think that should be possible but come with a little damage, so it is a tactical choice.
But if its better the way it is gameplay wise then i don't really care..
Doing 10% to 20% damage is small, but don't forget that some classes have the ability to make the "grunts" fight harder and more aggressively. If a 4 man team all used this ability one after the other, you would see a completely different set of minions (or grunts). So yea, a more effective group of AI grunts are already in the game, it's just up to the players to activate it.