It's still unique. There used to be a close knittedness back when Smiley and other trippos were here. It had a certain atmosphere that I still haven't seen anywhere else. Not to mention all the memes that have persisted for all these years. If you really think 4chon is the same as any other r9k/pol/b board, you either haven't been paying attention or you aren't a true chonner.
If you do invite randos from 8chan or wherever here, that would be the final nail in the coffin. For as little as I post now, if that happened I would leave completely. If you're a tranny instigator trying to herd people to your trannychan, think again, because I'm not interested in talking to you or your motley crew of retards. I would just drop imageboards completely if the 'chon dyed, and it's better for it to die than become bastardized imo.
If you just want to talk to average 8channers, then what's the point in keeping this site alive? Just go to 8chan and talk to them there and save HDV from wasting his money on paying for a server and domain name.