Keeping the older version of Dreamweaver is kind of the opposite of what we were trying to achieve by upgrading our IT. It also means that we can't develop those websites, as they stand. We'd have to completely redesign them from the ground up.
Unfortunately our clients simply wouldn't accept having to pay for redevelopment "every 2 years or so". That's the reality of it on the ground here I'm afraid.
Still, I am determined to move with the times because I'm hoping that it will give our company an edge. I'm hoping sales can come to an agreement on upgrade pricing considering that you've, somewhat, forced our hand on converting to PHP (ie. our previously purchased extensions simply won't work in DW CC).