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I think what he was trying to say (extremely badly) is that PBE is deserted and there is room for more people to join. I think..... again terribly said so im not 100% sure if thats what he meant.
Sadly, even if that is what he's trying to say - Ace has said quite a few times there may be sign ups open again if we can't start games for the next testing phase.
All people need to do is sift through the forum a little to find these answers, and to be patient. If we need more, Riot will recruit more. Currently I have been having next to no problem finding and getting into games, so...