They need to make just one major terrain update, THEN STOP MAKING TERRAIN UPDATES!!!!
Not only does it royally screw over every map you have already, it really screws up map makers and sets them back (sometimes years!) on their current projects!
The end result? We're stuck on the same damn 1-map rotation for about a year until new maps are done.
We still haven't recovered from the loss of terrains from the LAST major update. Karelia and a number of other special maps are still unusable.
I'm all for making the terrain better, I know it really needs improvements in a few areas, but the setbacks that come WITH said updates really hurt the gameplay.