I nearly did the same thing on another bitcointalk phishing site, back when PM spamming phishing links was still relatively new. Good thing that you did change your password.
I wouldn't say that a move necessarily would need to be made for theymos to acquire all other top level domains for bitcointalk, because most people will know that .org is the correct domain, and it's simply unfeasible to be doing it due to the costs. But there could come a situation where people are phished for their login details on these sites, even if right now they may not be a phishing site and may genuinely just be another bitcoin forum with close to no traffic, who knows what could happen in the future.
But this is a reason why bookmarking certain frequented sites is needed. You don't want to be caught in a simple phishing scam because of a momentary mistake.