If the animations for walloffire were improved you'd probably see that should a firebender go through their wall, they would probably part the flames as they go through. Speaking as a non-fire I believe removing a very effective strategy isn't all too smart. Maybe it does make sense, but it's still going to be a very heavy hit to firebenders out there. Which I do not agree with. Way I see it, eventually firebenders will just avoid walloffire entirely because of how counterproductive placing one down is. Should fire stop relying on their walls, then I see no problems picking them off as an airbender/earthbender. The ability is best used when you get in close with an opponent. Be that firejet into their face, or corner them in a hole. Walloffire is meant to make fire equal to earthbenders in close quarter combat i.e. caves. When I main air, the only thing that makes fire a challenge for me is their constant firewall placement. If they stopped doing that entirely I don't think I will have as fun fights with fire again. Mainly because they charge in, place wall, and fight within it as well.
A strong no from me, summed up a few reasons why as well;
1) Unbalance fire's close quarter strategies
2) Shake up firejet/firewall charging strategies.
3) While logical, counterproductive.
I see where you're coming from this, but I have to disagree simply because fire would suddenly get too easy for me. Not to mention it already is when I am water.