"Never" is a very big word. As I said much earlier in one of these threads, while the DSLR will always have more room than a phone, the phone camera will eventually get good enough that it will not matter to our eyes. Yes there are optical limitations, but Apple, Sony, and Samsung are spending serious money looking for ways around this.
Earlier, I suggested using two or more cameras and interpolating the data to get a better image in that form factor. A while later, Apple purchased a company that had developed a way to do so and I posted that link also.
I think DSLRs are safe for now, even from mirrorless, which are much, much closer. But the day is still coming, and missing out on obvious features like wifi control or deliberately limiting the shutter speed won't help there case any. The iPhone is great at taking snapshots in bright light. Give it that, and it will look really good. More challenging situations will reveal weaknesses.
its more that the public is being "instagrammed down". The iPhone definitely is, for the most part, good enough and will get better over time. But the big, bulky cameras are not going away anytime soon.