I wasn't suggesting to be petty or childish over the matter. You seem annoyed about the direction the new admin is taking the wiki, as if it is perverting all the effort that was originally put into it. Since you were saying that host (wikia) wouldn't allow the creators to remove the site because of how high it rated for them - then why not make it less popular, so that it was no longer of financial interest to the host, allowing the creators regain control over it again. It wouldn't have meant making the old site unreliable or empty, but just prioritising the new tfwiki, and putting in links to the new one from the old one. When the site wasn't generating as many hits, the host wouldn't have a financial interest in it, and wouldn't care if it was removed.
Once it was completely removed (the sub-domain or registered site) at the creator's request, someone else may register a new Transformers wikia, but I wouldn't think that wikia would allow the new site and registrant access and install your content on an entirely new wikia website.
You said that keeping the old site to direct traffic to the new site would damage your reputation, but allowing someone else to pervert your creation with the same appearance and format, people will think the new one is related to the old one, damaging your claim/reputation of objectiveness. At least if you still held the old site and directed traffic to your new one direct from it, without vandalising the old site, your reputation would have remained intact.