It would have mattered a lot. actually !
This is their own fault they pushed everyone to Ul'dah for so long now, it will interesting to see if the new marketwards features will alleviate this at all.Currently we are using the high spec servers for 2.0 to try and make this stable but the server process code is still current FFXIV code so this max limit reaches before the 2.0 server code. (Rather than specs more like can't use the threads efficiently)
If more characters concentrate on Ul'dah we can't handle just with server specs alone therefore we have put the restriction on new characters right now.
(Even with 2.0 with much better optimized code/optimized thread if the character concentrates a lot in one zone and hit's the physical limitations it will end up in same situation. 2.0 will have a lot more space for maximum limit)
Try giving Gridania and Limsa more unique content next time SE :P
One simple solution is to give Ul'dah two channels until 2.0 to spread the population between two instances. (Rokien would love this :P)
I am glad they are nerfing MRD . o/