They'll probably have to put larger porthole windows in the evac rows and the regulators should insist on real windows at strategic points down both sides for real time viewing in emergency. These can have conventional manual blinds. My guess as to why carriers want to do away with fixed windows is that: with fixed windows, it limits where you can move the seats. If you want to squash the Y cabin and put the rows closer together - the windows currently provide a clear indicator for pax. My guess is they want that gone - rather than what they do in the front. As for 'weight reduction' as has been stated, what they replace them with will not be light.
My two experiences of the 787-9 and their wretched electronic windows has confirmed that I will never willingly travel on a 787 again. Simples!