I currently run the Ezdrummer demo (8 days left) in Kubuntu 16.04 trough Wine (the compatibility layer for Windows programs) without any problems. The OS is connected to the KXStudio repository and I use the wine-rt package in 64 bit.
According to Harrison Consoles, 15% of the customers are using Linux. That should be a considerable high user base for most mentionable vendors unless they are just bragging about the high sales of their products. A Linux version is probably difficult with the version 2 of the Toontrack product lines, so I guess that we are stuck with OSX and Windows programs for now.
I'm using and have licenses for Mixbus/Mixbus32c from Harrison Consoles, Diva, Repro-1, Presswerk and Uhbik from u-he), DiscoveryPro from DiscoDSP, Loomer synths and also Pianoteq - All running native under Linux. I realize that it's hard for several programmers and companies to make programs that works in any Linux distribution, but they don't have to; it should be enough to make sure it runs statically in the 2-3 main stream long term support distros and AV Llinux.
There are also a growing number of music related vendors that are making Linux programs, we can expect a drum modelling software (like Pianoteq does) from u-he within a year or two. DAWs like Bitwig are still going strong and at least 3 DAW's and programs are using Ardour as the frame work (Mixbus, Waves Tracks Live, iZ Session) and not to mention Linux driving hard ware like mixers, and recorders and so on. Garritan do occasionally mention Linux when speaking about their ARIA Player engine. So with the future in mind, I'm really surprised that some vendors still choose not respond to postings like this or even mention Linux anywhere. The problem for some vendors is also that they have (quite stupidly) locked them self into using third party libraries and technology that only works in OSX or Windows - both because the technology and sometime licenses. But the number of even small companies that can make proprietary cross platform programs for all the three major operating systems are growing.
Since I don't find a trial version of Superior Drummer but the EzDrummer demo work so well under Wine, I'm going to take the risk and buy a license for it next week and try to run it one under Wine as well. I hope that a native Linux version comes, Toontrack's products are magnificent and I hope they do it before some of the other ones comes up with realistic alternatives.