Additional instances cannot be launched

So, it's Sunday and we'd like to do a few hc's and ZG for mount with a few friends.

What happens, is that on both Northrend and Eastern Kingdoms servers, the instance servers are full and additional instances cannot be launched. Well we got into the hc after 15min of jumping back and forth at the instance entrance; for ZG 30min trying and still no luck.

How about increasing the instance server capacity, Blizzard?