Interesting discussion.  I think the main reason e-on is segregating the Artist and Pro lines is that they are on two different development and support trajectories.  How would e-on for example handle the case where someone went from V6I to V7 Complete ($99) and then let's say 6 months from now, e-on comes out with a major .5 release as they have indicated (7.5 ???)  they will do as part of the Pro maintenance agreement.  What would be the updgrade price for V7 Complete to V7 Infinite then?  If you made it too inexpensive, it would cheat those who are paying maintenance on V7 Infinite now.  I think there is probably some middle ground here:

1. Increase the time frame from 30 days to 90 days on the updgrade choice trial period. 

2.  I think It's quite probable that e-on will put together some kind of special program at a future date to lure some Complete users into the Inifnite/xStream camp - probably at, or around the time of any .5 release.  Maintenance on infinite for the .5 or any other major release I think is around $395/yr.   I could envision some kind of special program, in the $400 ish range for this kind of move.