Yes

While I believe the reluctance to use downvotes is mostly due to economic rather than a UI reasons, I'd support any move to promote their use, however minor, like this one.

Overall, we're currently in a state where voting rewards are being used as staking returns through either bid botting or self voting. This is completely undermining the content discovery ability of this platform and is predominantly due to misaligned economic incentives.

While UI changes are welcome, I believe they'll make very little difference on their own. Having a certain amount of free downvotes (like 25% of upvotes) and bringing up curation rewards will likely remedy a lot of the economic problems and allow people to use their votes to actually reward content they find appealing. A tiny amount of superlinear can also help force all potentially profitable voting behavior into the light and prevent profitable micro spamming.