I'm right there with you, to keep Solo flying a viable way to rebuild the batteries will have to be developed. From everything I've seen so far, the process to get in to the battery case is destructive, so the only way to get a battery rebuilt is going to require a new case. Luckily, 3DR gave us a .step file of the battery that can easily be converted in to a .stl file for 3D printing. The .step file is here:
https://dev.3dr.com/hardware-batterybay.html (page where it is linked from)
https://drive.google.com/uc?id=0B9l93ZUM5ooxbUhDOUVVRWRORlkzdmY3LXI1T2YtVUJYbWtJ&export=download (actual .step file link)
3DR was even nice enough to give us this note: The envelope CAD file can also be used for creating your own power supply enclosures.
So, when the time comes, I'm planning to harvest the "smart" electronics out of my existing batteries and solder in new similar LiPo cells and put them in 3D printed enclosures. That is, unless a better option presents itself within the next 24-36 months.
At this point I'm sure that many will view a 24-36 month old drone as yesterday's toy and have a new shiny thing to go fly. I may be in that camp too, but I'd like to ride this for as long as I can. Hopefully someone will figure out a way to economically manufacture batteries.