I agree, factions are useless in present times where latest faction content "Skypetal Plains" can be easy clear by one person.
In my opinion, only glimpse of help for factions is add passive bonus for each faction, example 1% crit and 1% accuary for crimson and 1% hp and 1% ap for cerulean.
Another option that can help faction by ignoring it, is merge faction chat to one, combining full of trash talk crimson to silent dead cerulean.