Unfortunately, I wouldn't hold your breath. It's sad that they are lagging so far behind on internal updates, but at this point I think they care more about how it looks then performance. I'm just hoping they don't ruin the Macbook Pro next.
It can take months or years for a 3rd-party to reverse engineer the hardware in question and produce a compatible replacement.
Their viewpoint makes a lot more sense when you look at their Enterprise leasing program, where you effectively are paying for hardware "by subscription" and your laptop just gets replaced every two years like a phone. In such a setup, you don't want to stick extra stuff in the chassis that will go away when you replace the thing. You want all your add-ons to be little boxes with Thunderbolt ports, that you can just plug your replacement laptop into and continue on.