There is no way that Verizon has any say or significant influence in whether or not Adobe releases flash for the Android OS.
For normal apps, this is largely true. But normal apps are written in Java (which is slow), and depend on the operating system's compiled libraries (which are fast) to make everything work.
But to bring Flash to Android, it won't really cut it as a Java App. They'll need additional library support added to the operating system to get the speed they need from Flash.
Verizon controls the final versions of Android that get installed, and so they have complete control over whether or not the Droid has the internal support that Flash will need.
tom