You do have an interesting view on this. I'm just worried that the community jumped to this kind of decision too quickly. I would consider the different curve not the flat one.
Don't you find strange that witnesses is not enough active about this matter? I would vote for witness who opposed to liniar curve to see more thoughtful approach.
Actually, this has been debated for several months. If you recall, nearly 4 months ago, a near-linear curve was added to HF18 but was removed because it needed more deliberation. Finally, witnesses came to a consensus for HF19 on a linear non-curve.