I was a huge fan of GamesMaster, especially the earlier series and have quite a few episodes on VHS.
A comprehensive, tangible history would indeed be a fantastic thing to have.
Several excellent points have been made however, as to why this would seem unlikely.
Cost is one thing and time is another.
As much as we all adore Knightmare, sometimes a show has simply just "had it's time" despite how good or even groundbreaking and influential it was.
Sadly, Knightmare hasn't become a 'Mr. Men', 'Thunderbirds', 'Sooty' or 'Thomas The Tank Engine' which keep being repeated and even today have new episodes in regular production.
Even GamesMaster has been revived and rebooted a time or two.
While Knightmare has been repeated on a couple of channels over the years, and has plenty of clips on the ITV Children's Classics youtube channel, it has received next to no mainstream support.
There was a great amount of buzz surrounding the showing of two episodes as part of CITV'S 'Old Skool Weekend', the 'Geek Week' episode and of course the convention, but this was all a decade ago and very little has happened since.
Series 4 appearing on BritBox Was also wonderful, but that too seems to have been rather quickly forgotten about.
I say all that to say while Knightmare does indeed have many old fans, who I'm sure would want to buy the book and perhaps even support it's production without it being readily available (Officially at least) it might be more expensive than it's worth if Knightmare isn't creating/getting any new fans or isn't anything more than a faint, if pleasant memory.
Though I don't wish to appear negative, so it would be an amazing project, and with next year being the 30th anniversary of the final "Time Out" who knows what could happen.