Pls, you can make things quicker by getting more people work on it the same time. If there is really interest and the market seems to promise profit, they just hire some more people to do the job quicker for the project.
I was only partially serious but my point still stands. These things take time. No point in the throwing the episodes out, thats when the quality starts to slip.
TOS remastered is taking time, they are trying to get the episodes right. Of course the process is going to get quicker, but I honestly dont want a conveyor belt of TNG HD episodes.
Simply put :
1) There are more episodes
2) There are more fx shots per episode
3) They will probably have to re-edit the episodes from the original masters.
Plus, in my opinion
4) It doesnt really need doing