Emergence of the Smartwatch

In GigaOM:  A not unexpected development.  They have been around for years.  Now 2014 seems to be the year for broad delivery.  iWatch expected soon.  How will this influence the more personal vs business uses of the smartphone?  Will it have commercial uses despite the yet smaller screen?  In some of our own work we have seen a specification of  the delivery of Business Intelligence applications on the smartphone.  Will this lead to delivery on the watch as well?  How they will integrate well with other devices and tablets also remains to be seen.    What is the ideal number of devices we should have with us?