I think that the new portal building is too jammed / crowded others like it so i think you should keep both buildings and people can use whichever they choose.
I personally think it's fine, and the point of the new spawn portals is to get rid of the giant, ugly building over spawn.
Well to get rid of the big ugly portal building over spawn doesn't require making a new one you can copy and paste to new location using worldedit with no problem at all. I'm just saying they should keep both.