3.5mm is not going anywhere until something completely superior replaces it, and even then the transition will take years.
Again, I think this isn't true either. The reality is, every year Apple squeezes more and more tech and features into the phone, all of which require more and more battery. At some point miniaturization and processor efficiency are not going to offset the need for real space.
So let's look at this realistically. Apple has four redundant ways to get audio out of the iPhone: 3.5mm, Lightning, Bluetooth, and Wifi. Three of which are standards, one is proprietary. Three are multifunction, one is audio only. Now, let's say you have to choose one to get rid of in order to make room for some must have new tech. And let's say for the sake of argument without getting into the merits of each, that you keep the standards, and lose the proprietary Lightning jack. Instead, the 3.5mm jack becomes a multi-function jack like the iPod Shuffle. It offers data transfer and charging though a digital controller, and audio. I'm not sure the iPod Shuffle can charge and be used for audio at the same time, so maybe Apple has to go to a 5 conductor plug adapter for that situation, as they have to maintain universal compatibility with everyone else. Now you don't reclaim as much room as keeping Lightning instead, especially if you have to make it bigger so you can charge and listen at the same time, but you keep everybody happy by keeping the universal audio standard.
So is that a better solution for everyone who are insisting the 3.5mm jack shouldn't be removed? I'm pretty sure the data transfer is going to be much slower, but there's always wifi right? And Apple is also pushing for the cloud. Any device that can be used over Lightning should also be able to be adapted to a 4 or 5 conductor pin too, right? Am I missing anything here?
If this happens to be true, I think Apple may be quite happy to have this information leaked early. It prepares more people for change so there won't be as many going "what the ****?" when they eventually say "We've removed the 3.5mm port to shave off 1 whole micron off the massive iPhone body!".
I tend to agree with this. In fact I would not be surprised to find the 4" iPhone is released this Spring without a 3.5mm jack. By all accounts the rumored 4" phone will likely pack most of the 6S tech into a thinner 5S-sized case. And rumors suggest it will have a larger capacity battery. So in my mind something redundant had to go (and even at that I doubt it will have 3D Touch). If this is really going to happen, the 3.5mm jack is the perfect thing to go on a phone that already doesn't have enough space to meet the flagship features. And it's a really good test, because Apple knows there's a pent up demand for a 4" phone. Recent surveys show something like 40% of the installed iPhone base is using the 5s or smaller. Given that, customers may embrace the new 4" phone with most of the new flagship features, and not care about the 3.5mm jack. If it ends up being a non-issue for the 4" that will truly pave the way for a smooth 7 rollout, as well as get manufacturers up to speed with great new products for Lightning and Bluetooth. And regardless the mere fact we're debating it now, will give everyone time to get used to the idea, as well as manufacturers an opportunity to prepare.
And let's face it, the 6 and 6S phones will still be available, which will be sold to customers who can't afford the latest and greatest iToys. So from that perspective, they will still have those 3.5mm ports to use with their cheap headphones, or ones they spend a month's salary on they can't afford to replace. But the 7 customers are usually on the cutting edge, and are the customers who can most afford to buy a new set of headphones to use with their cool new phone. Both the 7 and 7S will give at least two years to the iPhone market, without necessarily sacrificing sales for developers and manufacturers to catch up with technological innovations which will make both wireless technology more desirable for most, and Lightning products more exciting than what's available for Android and Samsung. Of course by then they will have likely dropped their 3.5mm jack to, because it's quite likely that Apple's competitors have likewise hit a wall between offering new features and the space to implement them.