This doesn't bother me at all, and makes tons of sense. I think most of us are happy to simply have a real answer finally.
Of course, it doesn't mean a person has to stop using the software. Obviously it still works, and while of course no one wants to make their main music platform a dead-end, it doesn't mean it's not a great tool for certain things (beat-making, pattern generation, idea-catching...other hypen-related things...
)
For the people who are upset, I would mention simply that P5 just never got a foothold worth Cake's continued investment. Big deal. Things get cut all the time. I'm sure Cake were hoping P5 would be a Reason/Live competitor and it just worked out that the other two programs found their niches faster and better. It's a shame, but it's just reality. I'm not gonna stick Cake with the blame that more laptop-loop kids liked Live more.
Looking to the brighter side, I think it FINALLY opens up the door for P5's still-awesome features to be ported over to SONAR in some way. Like Candlesayshi mentioned, SONAR is indeed in need of a semi-major transformation (and really, if sticking to the 10-year timetable they have, SONAR 10 would actually be a brand new product) and now we know what some of the awesome tools they can bring to bear.
I doubt it was anything nefarious on the part of Cake, I'm sure people like Seth over there were totally bummed about it, but I think they prolly had some long long meetings and realized it wasn't a success, nor a fit for their plans.
Like I said before, I'm just glad to have a definitive answer and am excited that it now means all the good parts of P5 are fair game to yank over to SONAR.