The second part of my OP dealt with this. Do you think any other game companies are taking a que from this? I hope so. I'd love to see things like Pathfinder or nWoD or Runequest or... I think you get the point... have this wonderful online presence and tools. Sure, they don't have as many fiddly bits (feats + powers + classes + etc), but I think the ease with which DDI makes playing and creating for 4e might translate to some other games.I also wonder if other game companies are paying attention to the draw that DDI has on the 4e crowd including those who might otherwise drift off to other game systems if it wasn't for the fantastic usefulness of DDI.
Just one warning - if you uninstall it or switch to a new system, you will need to resubscribe to get the full content beyond the demo version. Unless you figure out which parts of your system to back up for it and can bring that backup to your new computer.That sounds like a good idea. I had no idea the CB/MM would continue to function after the subscription ended in this age of DRM and greed. Kudos to Wizards if this is intentional and they plan to keep it that way.
What (if anything) is in the Compendium that the CB/MM doesn't cover, by the way? The only thing I can think of at the moment is items, but then again, maybe the CB contains those as well?