People tend to react against change. IIRC something with Newton's 3rd law
The other famous quote that could be applied in this particular case: "If it ain't broke, don't fix it"
I do like the general concept of keeping the forum and product "in sync" as far as look and feel.
The problem for me is that I personally find the White on Black format harder on the eyes.
For pfSense:the product I can set up the themes the way it works best for me and carry on.
For pfSense:the Forum, presumably we're all stuck with whatever format gets picked as the consensus.
Unless there's an option to change the forum "theme" to what you personally prefer (translate: what's easier on your eyes) I vote, leave well enough alone.
Just my $.02