Unlike the whole "red AT-AT windows and green AT-AT laser thing", the work on making the TIEs grey has already been done. It would be nice to at least have the option of a grey TIE version if it comes to it.

My biggest issue is mainly maintaining continuity with ANH. While I personally love the visual aspect better, I would rather have continuity continue than retcon ANH.

Even so, I've more than made my piece, so I will leave the "grey versus blue" debate and give the floor to someone else.