Pros can justify the price if the performance is top-of-the-line and downtime is zero (or support & fix is near-instant).
If Apple's quality control game leaks over into this new Pro line, then there will be lots of unhappy professionals staring at their $11k paperweights while shopping for something else.
They can justify the performance to a point. If it costs twice as much as a competing system offering similar performance, reliability, and service, it becomes much more difficult to justify.
If Apple's quality control game leaks over into this new Pro line, then there will be lots of unhappy professionals staring at their $11k paperweights while shopping for something else.