This new form factor would be perfect for cameras that shoot RAW video or high-bandwidth video. Until recently you'd need to buy very expensive and fast SD cards or proprietary RED mags to be able to record high quality high resolution video. BMPCC4K was the first (very affordable) camera that allowed recording directly into a USB SSD.
For laptops and tablets this could be a huge move, partially because of the user-serviceable upgrade potential, but also because of data recovery. Instead of the flash chips and their controller being on the same board as the CPU, GPU, muxes, power management systems, etc, they can now fit in a secure, low profile and low footprint socket. Take newer MacBook Pros for instance. They have soldered on storage and no way to access that data if the logic board dies. Previously, Apple had outfit the board with a "lifeboat" connector that allows for data transfer from the soldered on storage (assuming it's still intact) without having a fully working board.
Louis Rossmann, of course, went over this in a video just a couple days ago. He had a customer that sent a machine in that is a few-months-old MacBook Pro 13". It has a dead T2 chip which renders the entire logic board useless. There is no way (short of desoldering the flash chips and possibly putting it on a working donor board, but then you run into a whole slew of other issues) to recover data off of that machine.
This new form factor changes nothing for cameras since cameras have proprietary storage for the sole reason of squeezing producers for more cash. RED mags just have cheap (not even high-end) M.2 SATA SSDs inside them, and the camera has a DRM check to ensure that it's one sold by them so you can't just swap it out for a higher capacity one.
Why would they ever adopt an open standard when they can charge thousands of dollars for a proprietary one instead?
In my eyes, this sort of connector gives manufacturers no reason to solder on storage. There's the cooling issue, but looking at something like the MacBook I could see it integrated into the CPU block or even the bottom case. Hell, if they did the bottom case it might even give some support to the logic board and they won't have as many issues with the board flexing. No rubber pads needed!