This is very odd, I was under the impression, obviously mistaken, that the new road would bypass both Arnage and Indianapolis corners, which would make some sense and you could still retain the banking. The only reason I can think of that this is being done is to improve safety the rest of the year at a dangerous crossroads, presumably a small roundabout at the present crossroads would not be possible because of race requirements. I've also seen idiots race week going round Arnage as though the road from the left was closed on the run up to the race.
Although I believe the ACO would like to encourage spectators to stay in the main complex, and have been pushing that for several years, I would be surprised if there was be no viewing points at Arnage.
Look on the positive side, the new banking a Tetre Rouge is a huge improvement and I hope to eventually see similar at Arnage and if it included banking to be able to see the approach to Indianapolis then it would be a major plus.
