Don't write off Magix. I've seen firsthand what's involved when one company buys another

. The Roland/Gibson transition was unusually seamless, which in retrospect I think had a lot to do with both Roland and Henry Juszkiewicz wanting it to happen properly. However in many ways this was not the norm, and such transitions usually take longer to unfold and are more complex.
I was an expert witness for Magix once in a patent suit, they are a major force over in Europe and I suspect part of the Sony purchase was to establish more of a foothold over here. Magix has done well with their own video software but IMHO it's not quite up to the level of Vegas. So regardless of whether they develop Vegas independently or fold it into one of their programs, I suspect use Vegas users will be able to carry on with an evolving program. Now, if only they'd do lifetime updates...
As to Acid, I know of at least one other bid for it but it was rejected, so it seems Magix wants it...maybe to integrate more fully into video, I don't know. I have no idea what the plans are for Sound Forge.
However... I'm pretty much with Chuckebaby on this one. If you team up iZotope RX (and possibly Ozone) with SONAR, there's not much you
can't do. More and more, I'm mastering in SONAR, and I keep pestering Cakewalk about how they could make SONAR a true mastering platform with what I think is not a lot of effort...we'll see what happens.