Basically it works like this:
There won't be ranked because of the small population that play DOM.
The population of DOM is small mainly because of lack of ranked.
(That's Riots logic anyway)
So in other words, unless Riot can somehow magically change peoples minds about DOM, there will never be ranked, and the people that do want it (about 90% of them from every person I've ever spoken to on the topic) get shafted.
So pretty much, we don't matter because not every ******bag and his grandma are interested in the game mode. Great logic aye?