Did that morph into It's only tv but I like it?
No, just as A Question of Sport didn't morph into They Think It's All Over. A Question of TV came at a time they were flinging out endless variations on the format, there was A Question of Pop as you say (which I enjoyed, but I do love a pop quiz) and a 'stEnders variant for its anniversary which seemingly led to this series. Was bloody awful, though, and incredibly uninspired, as can be illustrated by the fact that while A Question of Sport has home and away, and Pop had A-side and B-side, this had "easy" and "difficult".
It might have been interesting to see if Hill would have gone on to do a Bob Monkhouse - go out of fashion and then come back in and a resurgence - if he hadn't died in 1992 that is on the same day, it is stated, he received a new contract from Central in the post.
Well, he did come back in fashion a bit because they did an Omnibus documentary about him in 1991, and then the next year there were repeats on ITV - indeed, they were running when he died. In 1993 they showed some on C4 as well, and I remember it was just after they started selling their own advertising and there were pieces in the paper about how this was the start of the decline with mass dumbing down (except of course they showed loads of old comedy, in every era). It's interesting how quickly Hill came back into favour, though, cos his last show was in 1989, but by 1992 he was already back on ITV in repeat form.