tlw
Simple human inertia makes toppling a market leader very difficult.
True, but there are two elements in play - getting people to switch, and enticing new users.
Pro Tools is still the top dog in the industry, but its market share started declining a while ago and continues to go steadily downward. Although some of this is likely due to people switching, a much more important reason IMHO is that people getting involved with music and computers have so many more choices.
The Mac was always "home turf" for Pro Tools, but now someone buying a Mac gets Garageband for free. So let's presume they like it. Now they want to move up. Are they going to buy Logic Pro for $199 or buy Pro Tools? I'm convinced a large part of PT's erosion is due to Logic Pro, because people just don't see a need to buy into the whole Pro Tools ecosystem. When I ask what DAW Mac people use at seminars, it used to be mostly Pro Tools with a few people using Logic. Now that's reversed. Granted it's anecdotal evidence, but I think it's meaningful.
There's additional erosion from more groove-oriented musicians who gravitate to Live, FL Studio, and Reason. They have absolutely zero need for Pro Tools. Then there's also the fact that SONAR has been picking up a lot of new users since X3 was introduced, and SONAR 2015 is accelerating that. While obviously that's not going to topple Pro Tools, it just underscores that someone getting into DAWs has a lot of choices these days, and to many of these people, Pro Tools just doesn't seem to offer value received.
On a side note, as to switching, I am familiar with multiple DAWs and I don't find it that difficult to move from one to another. Over time as they continue to "borrow" features from each other, their basic operation becomes more and more alike. A good example is the external insert in Logic; if you know how it works in SONAR, you know how it works in Logic. I highly recommend that people learn other DAWs, not only because it will make you appreciate SONAR more

, but because some have functionality that SONAR doesn't appear to have - but SONAR's toolkit can allow you to do something either similar or identical. A lot of the "how-to" articles I write about SONAR are inspired by theoretically not being able to do something another DAW does, but then figuring out a way for SONAR to do it.