Posting to show my support for this change, and to argue that the original time frames make much more sense.
This change encourages the creation of new heroes and likely increases the amount of people who will be actively playing the game, which is one of the most important goals for any change. I liked the original time frame for the warnings, because as others have pointed out getting to level 6 can take about 15 minutes, leaving name hoarders an easy way to effectively lock down a name for a year in exchange for a minute or two of time to login.
I know a lot of people in this thread are frustrated by this potential change, and while many of them argue for their point quite well I suspect that they are the loud minority in this case. Since they see themselves as the ones being the most affected they are also the loudest about the change.