"We plan on doing it by X" leads to massive raging if anything happens to push that date back, no matter how low-priority the work is.

"We plan on doing it eventually" leads to massive raging when it doesn't appear quickly enough, usually within 6-12 months, especially if any patch feels particularly light on content (regardless of whether that content was actually light work or not, or what other work is going on).

"We don't plan on doing it" sentences the argument to the woe-is-me-the-devs-hate-us-specifically list of grievances for the indefinite future.

"We would like to do it, but it's low priority" leads to, again, massive raging whenever a patch feels light because clearly the work could have been done then (see previous caveats).

"We might do it, we might not, who can say" is perhaps the most truthful response for low-priority requests. For obvious reasons, it is also not something that typically goes over well.

Therefore: silence.