I think it would be a good idea to merge servers if we are all going to be taken to new servers at 2.0 anyway.
But there are some things that might be a bit tricky to manage...

The other day I wanted to summon my retainer at the armorfitters row in Uldah (Besaid server) and it said that it was impossible to summon my retainer there as it was full.
I can only imagine how full the market wards would be if people from other servers merged to Besaid...

Another thought that this brought to me was how do we know which server we will go when 2.0 comes out?
I don't want to be on a server which is full of lvl 50s with all the gear that is possible to get. I want to be able to interact with the new people and sell them the stuff I craft etc. But at the same time I don't want to be on a differen't server from the friends I made...

Solution, before 2.0 SE gives us a month to decide which server we want to go to (this gives us time to discuss this with out friends) and the ones who don't choose gets distributed to random servers. At this same time we could re-do our characters (like mentioned before due to new races coming to 14) and be born again with maybe a new shorter (one part) name etc.

BUT for now... server merge YES PLS, but pls do it right and not just merge em... market wards and exp camps would get PACKED!!!