do you think an iOS launch will affect things that much?
It will have some affect. Mainly eating up all the oxygen in the games media, general economic reasons and simply the amount of TIME it will suck up too.
When you consider that DBC is now caught up in the week of 2016's biggest film AND one of its biggest games, it just pushes it futher into the niche and can only discourage a wider audience.
I think those that were going to buy DBC will still buy it: it's just going to be harder to widen the net: certainly I think marketing spend would be really waster there - maybe some big new feature added in free DLC plus a bunch of fixes and improvements some time in the new year would be a better time.