Very sad to see. As a business user there are two main reasons we did not go with bb10.
Firstly having to have a completely separate BES infrastructure for 10, no backwards compatibility. What were they thinking here? Cannot understand this at all.
Secondly removing the international roaming fixed monthly cost meant there was no real cost saving in sticking with bb for our traveling users.
So we have terrible business strategy in both business and consumer markets leading to the mess they are in. While it's easy to be captain hindsight, surely everyone predicted this? It couldn't go any other way.