Years ago (1998 I think), I bought a copy of Pro Audio 9, as I was told by the salesman at my local music shop that it was one of the best DAW's available. He said it was easy to learn, and would do almost anything any other DAW could do.
I learned it as best I could and then put it down for a couple of years while I was concentrating on other things.
When I came back to music recording years later, I was told that Pro Tools was the DAW of choice for musicians now, so I purchased a copy and tried my best to learn and use it. I also tried Cubase, Audacity and Garage band over the space of 3 or 4 years, but put most of my time into PT.
In the end I came back to what was now called Sonar 8 then almost immediately upgraded to 8.5, then Sonar Professional and the new skylight interface.
Maybe it's the thinking that Sonar is a jack-of-all trades and a master of none that leads to the thinking that it can't be a "professional" application. But I think that is selling it way short. I'll wager those that think that way, have rarely used it in anger, and haven't taken the time to
really learn it.
Also, the fact that PT is used in so many studios the world over, makes it difficult for Sonar to break into the initial purchase realm of those starting out in this industry.
I think all Cakewalk can do is continue to produce a class product. Eventually a tipping point will come where people will look back and wonder why it took so long for Sonar to be recognised for what it is, (a leading and innovative application in it's field).