the current border is 200k by 200k and extends up to 100k in each direction from spawn. In the overworld this ok in size but the problem comes from the nether. the accessible nether by a portal is only 25k by 25k and stretches by 12.5k from spawn in al directions. as mentioned in cellexya's blaze grinder thread that some fortresses are up to 1k by 1k and considering the whole thing is only 25k by 25k makes these fortresses into hotspots to get blaze rods for potions. This turns the limited number of fortresses into hotspots for blaze grinders. Cell is very cautious and destroys their portal when shes done with it, but nether travel requires a network of pathways to get around whether its building across a lava pit or drilling into a mountain. We cannot fill up every mountain pass create (destroying bridges are ez) and we all have to admit, there are always some sneaky hackers out there which are extremely sneaky and aren't caught in time before they x-ray a base, or even if they have a garbage set up like me and the chunk doesn't load allowing them to find paths. This threatens the security as the person can estimate the position which one came out of the destroyed portal and then walk around for 2k or so and find their base. also for an above ground base if you think about it going to 80k or so isn't actually very safe.
LAG: I fear that some may be concerned with the possible increment of lag, this probs wont happen as only the chunks that players are in are being loaded and as far as I know we aren't even close to tipping the 88 player limit. However this will mean that crafty will need more storage space to store the world.
staff: please let the players think about this and their opinion on this before you make a sudden decision, as players might have a different opinion that what you think.
travel; but how do I get to (I recommend 2 mill x 2mill or 1mill from spawn) blocks out?
a: nether roof, some servers ban nether roof but its available to us.
edit: The reason I left crafty is because of the world border, and even though I don't mind reset that much a little but cuz of the world reset(only a little for world reset)