Yes. It will be interesting with other algo. If you can improve nist5, x17, c11, equihash, neoscrypt, etc - it will be nice. Even not only for 1080ti but for all green cards.
Improvement of nist5 would be useless, there is Baikal miner with 10GHs/s which is equivalent of 100+ Nvidias 1080Ti.
Yes, you are right, i`ve forgot about it. But other algos upgrade are actual, mostly neoscrypt i think. Green need new miner, after last claymore.