Well since this topic is still ongoing, I did a little research yesterday - as I said I would, and because I thought I had read that the SSD drives slowing down and problems from writing constantly onto an SSD drive were a myth - it would seem that there are a lot of conflicting beliefs on said topic.
ZD Net says
http://www.zdnet.com/article/worried-about-ssd-wear-you-probably-dont-need-to-be/ This blogger says
http://blog.houzz.com/post/115950977148/the-myth-of-ssd-performance-degradation There was another article which reiterated some of the comments in this thread.
Here is my take on the situation after doing the research and thinking about everything SSD drives. In the beginning, I suspect SSD drives did have the problems that posters on this thread believed they had, but like early digital...the technology improved out of sight. Then what happens is the old problems associated with the technology, becomes ingrained...like a myth that had an element of truth, but never was the full truth.
I wouldn't worry too much about SSD drives failing personally, so long as everything is backed up. If you have a boot SSD, and an audio SSD drive...you will see benefits - like improved boot times, improved program start times, and indeed higher track count and lower latency. The only time I would use a spindle drive in this day and age, is as a storage drive, and indeed this is what all my spindle drives are used for.
This however, is just my opinion, which I have gleaned from using an SSD drive for audio for the last 3 years.
Ben - I hope this helps the OP