FTB would be a one-way trip and if they first stop updating it the world would be doomed. That's why I don't like depending on mods.
I didn't really like the amounts of iron that you could get from the iron farms, but now that I just built a farm, it feels a bit ridiculous to see them planning to remove the feature a few weeks after the project got completed.
A positive side could be that the wiki says they have a much greater spawn rate, meaning you could kill off more, even if you have to finish them off manually.