If I might... a parallel tale from long ago.
The first computer to make it into my studio for real was a Commodore Amiga 3000 tricked out with the Sunrize Audio Card. By today's standards it was pretty crude, but mostly I locked it to time code and let Bars&Pipes Professional drive my MIDI gear. And for that it was outstanding.
When Commodore went belly up I decided to stick with the Amiga for a while longer. There were lots of rumors about a third party riding to the rescue, and it did what I needed with no major issues - as I recall no minor ones either, but who knows, it was a long time ago.
That strategy worked well for me, until it didn't. The rest of the world was racing forward, plugins were no longer an oddity, and audio and MIDI in the computer was becoming standard fare. I wasn't sure why, at the time, I'd want to stop using my tape decks and slaving the computer to them, but I did start reading, and talking to friends.
As good fortune would have it, almost all of my friends were using PCs in their studios, or developing hardware an software for PCs. It wasn't a difficult choice<G>!
And it worked out quite well for me. I switched from Bars&Pipes to CWPA (don't remember the version), and I was able to keep MIDIQuest. I also switched from SampleWrench to Sound Forge. In all three cases these were net zero trades - I gained a few features, I lost a few too, but mostly it was learning curves and I was back in business. And I was now able to work with audio and MIDI in the computer!
Pretty cool!
I share this because I think we really are pretty safe for the short term. And I think we will all need to switch platforms at some point. There won't be a white knight bailing us out - at least that seems very unlikely to me. But it doesn't stop me from using Sonar for the foreseeable future. I know where the problems lie, I know how to work around them.
What I will do (lesson learned) is export any project that I might wish to revisit to plain old audio and MIDI tracks, and I'll take copius notes about processing and effects. I'll also export all presets to VST format.
This is bad, make no mistake, but it isn't the end of the world, except maybe for the employees, who clearly had a pretty sweet gig!