I'm hoping it'll be a new permanent 55+ AT LEAST because there's only two campaigns that's worth farming and that's Sewers and Nuri's. I think for getting to such a high level, your doors of opportunistic farming should have a various maps in which this is possible. Rather than just doing sewers or nuri's all day and/or night. :\
Sorry if what I said above seems a little... not grammatically correct. I haven't gotten much sleep and I'm typing this in the dark XD