Removing signature globally will kill this forum from having visitors.
No it wouldn't despite how much you want to believe this...
Nobody knows for sure what would happen in that case, but I think it is very likely that forum traffic would decrease and that it would go somewhere else, like Roger Vers forum.
Some traffic would remain here for sure but Im far away from thinking the overall result would be wonderful, and I also think if Theymos hasn't taken that measure yet it is because he thinks something similar, otherwise he would have taken it a long time ago.