I noticed in the
patch notes for Journey's End that were released today that they are adding official support for texture packs.
So it's very possible mods like this will be much easier to install and enable/disable. It will depend on how the implemented the system and what assets they are allowing to be edited by these packs (could be only blocks or something, we don't know yet).
EDIT: I cannot for the life of me figure out how to get texture packs to load. I also cannot find any information on the internet, official source or otherwise, on how to use these (though the official forums are down at the time of writing).