As mentioned in a previous post, while we may not be responding, it does not mean that the thread is being ignored. All the information is being passed along, including the various suggestions for alternative ways to handle the whole situation.
However, all of these ideas require some time and effort so it may be a while till at least one of them gets implemented. If you remember the letter from the development team it mentioned that improvements for GvG are planned, but that they are time consuming. This also means that for the time being, the recalculation time will remain as it currently is, till an alternative is implemented.
The time change may not completely eradicate all issues related to GvG, but it should minimize them. While clearly for a number of players GvG is the key feature in the game, other players do demand development time elsewhere. For example polishing the new cross-platform messaging system is also a high priority.
So, short version, yes the development team are aware of all the feedback regarding this change. Unfortunately for the time being the recalc time will remain as it currently is, but any ideas/suggestions for improvements regarding GvG performance are welcome and will be discussed with them so that hopefully in the near future a solution is implemented that satisfies the majority.