I do genuinley think that the park are trying to do the correct thing with Colossus, they have identified that the ride is beginning to come towards the end of its life cycle and have decided to fix the track over multiple closed seasons so it doesn't have to have a prolonged period of downtime so the ride can still opperate, so the capacity of the park doesn't take a hit.
However, I do have some issues with the way thorpe are going about this retrack though. Firstly, I do believe that the better investment for Colossus would be some new trains. The ones they have currently are outdated and very, very uncomfartable (considering I'm 6 foot 4 it is almost unbearable sitting on the breakrun after the ride is over) and I'm sure many would agree with me that new trains with lap bars would definitly change the ride experience for the better. Also, I'm not fully convinced on Taziker doing the retrack. I know that they are a respected company in the retracking buisness considering they were the company that did The Big One retrack but I do feel thorpe may have cheaped out slightly going with them as the retracking company. Considering that Arrow Dynamics is closed down, the only option blackpool had with The Big One was to get an external company in to do the retrack, however, Intamin is a major player in the industry and still even offer the multi-inversion coaster as a model they sell, so I am slightly confuded on why thorpe haven't got Intamin in to do the retracking like towers are doing getting B&M to do the Nemesis retrack. I know there may be a number of factors for why thorpe have chosen Taziker over Intamin (price, ride downtime, etc.) but I do feel like it would have been the better option to get the original manafacture in to at least cosider a retrack of the ride, but then I guess maybe thorpe have done that already and I just don't know about it.
About the area feeling run down, definitly. I think the whole of the Colossus area needs some 'thorpe loving care' as they call it. It just feels like the ride has been neglected for years.
I do hope this is a step in the right direction for the park with them definitly having a bigger focus on repairing and tidying up the park at the moment, although with thorpe's history anything could happen.