The typical listing agreement gives the agent exclusive access to the commission, and that doesn't seem like it will change. And the listing agent can put as much as they can get away with. But, as mentioned, it might go more to a fee for service model, rather than a percentage. So you want staging, that's $X, you want a walkthrough simulation, that's $Y, etc. You might owe those whether the property sells or not (unlike commissions).
All that seems to work, but I'm not sure how the buyer's agent thing will work.
Say I come to town and have someone drive me around and show me places. What if I fall in love with a seller who writes $1 in the buyer's agent commission field? When is this fact disclosed? If it's after I fall in love with the place, that's a problem.
In the past, I've used several agents to drive me around... using the one who specialized in various neighborhoods. I never was on the hook to compensate them, as they knew every place they showed me had 2.5 or 3% commission.
What I see in the future is buyer's agent having you sign an agreement with compensation specified for the buyer's agent to come from "somewhere". They'll sell it as "we'll get the seller to pay."
So now, as a seller, you might have two offers for "the same amount", but one buyer's agent awarded themselves a 3% commission, and the other a lesser amount, or a fixed amount based on the actual work performed.
So if you are a buyer, and you just sign whatever they put in front of you (a high commission), you're going to be at a disadvantage with any offers you make. IOW, as a buyer, you're going to have to negotiate up-front, or resign to pay the commission out of your own funds.
It should be interesting to see this play out.
Whenever entrenched processes get upset, it's gonna get messy.