If people are finding it quiet then they should perhaps consider joining more linkshells. Linkshells are, afterall, player created private chatrooms. They don't serve any other purpose at this time.

If they were to introduce a global channel, I would like to see the time limit between /global shouts to be 2-3 minutes so that it's not viable for conversation and it is used solely for asking questions (only need to be asked once and can be replied to with a /tell) and forming groups (if the channel isn't spammed then it should be easy to see).