Right now Google is getting the majority of all gTLD traffic by default. Go try any phrase with a .whatever, put it in the search bar and voila google sweeps you up.
Hello.cam or any other string you like. So Google already knows about that traffic and whether there is much of it at this.point. Any word separated by a period and no extension and Google is there to rescue you. I assume if you have your browser setup for Yahoo you will have the same results.
So as they each come online, the search engines led by Google will lose any traffic their might be. Of course, it may not amount to much.