I have no idea when or if The Smiler will re-open, however the decision can not be made either way until HSE have deemed the ride to be safe and a full report detailing and explaining the incident is released. I am sure that Alton Towers will continue to deal with the situation as professionally and appropriately as they have been doing, however it is not in their hands at this point.
My personal opinion is that the ride should re-open, however when is at the discretion of the park and HSE.
The fact of the matter is, the Smiler is
a safe ride. It would never even have been opened if it wasn't safe. I really hope the length of this investigation isn't distorting people's perceptions of this ride, because as with every other roller coaster in the world, they're safer than cars, planes, parachutes… etc… this was merely a fluke accident. HSE will consider if the same set of circumstances will be repeated, and the steps to take to completely eliminate this. They will simply be looking for that extra level of safety. NV's interview with Kay Burley does (unnecessarily repeatedly) go on about how the rides were 'not safe enough', but it's like looking at a crossroads, and asking why every single crossroads is not traffic-light controlled to allow just one direction to travel at once. Sure it's obviously safer, but it's really unnecessary. If the report comes back human error, I suspect HSE will want to remove that human intervention power, and hand 90% of the operating control over to the ride, as when running properly, machines are more reliable than humans.