1) Interesting that they're not bothering to notify unpaid users of the aspen stack. Side benefit of this, I guess, is that they can shed some of the unused, unpaid apps they've accumulated.
2) In light of 1, It'd be nice if there was an easy way to find out if I have any aspen apps. I had to go to the settings page for each of my apps to find out I'm using Bamboo and Cedar across the board.
All unpaid apps are put to sleep when not in use to save us costs and to allow us to continue to off a free tier. (you can get rid of this sleep functionality by adding an extra dyno). Getting rid of in-active apps really doesn't buy us mutch, maybe a few megabytes of hard-drive space.
We are interested in all developers having a quality experience on Heroku and this includes the migrating experience. We differentiate between "production" and "development" quality applications in a number of areas such as https://status.heroku.com. We consider a production application to have at least 2 dynos, and a non-shared database. At the end of the day we are not a free service. We will go above and beyond when possible by offering personal support to those who need and value it the most.
I would like to add that the number of users of Aspen is incredibly small. If you don't know already, you probably don't have one.