If they are reducing the timer for Meebles, and people still want their glowy gaxe etc. you are going to see lines of people waiting to enter the battlefields. If you then merge servers, those lines will double in length. Similar problems with your favourite Dynamis farming spot.
Any server merge at this stage would have to be accompanied by alternative methods for acquiring items from instanced or very popular events that are discouraging players because of overcrowding. For instance, being able to buy Meebles or VW glowy items, using large amounts of credits that can be obtained by farming other less overcrowded MB/VW zones. Or changing repop/drop rates in Dyna, so that lots of people can farm the same areas at the same time.
Its not that server merges are wrong, it is only that they would need to happen alongside appropriate changes to some of the current battlefields.