It's really not the culmination you think it is. Fitzmartin wrote the character in back-ups for several issues and people were not thrilled with the switch to making him a bi character and even less so pairing him with Bernard. Rossmo has been around the industry for several years and is fairly well known for very stylized art. Which, while it worked more so for Harley Quinn, it did not work at all for Tim Drake: Robin, combined with the poor reception of the writer and the changes she made--it really did turn people off to the book. With previews and word of mouth from previous work, people are going to not pick up a book that is considered bad by a majority of people. While DC and Marvel may be in the business of selling characters, they can't do that without creative teams that people will accept and people did not accept this team. Comic books cost too much money these days to buy a book that one isn't going to enjoy or agree with what the team is doing to said character. Fitzmartin wrote Tim completely out of character, ignored other fan favorite characters and while the sell was a bisexual Tim, she wrote him as completely gay ignoring his past relationships.
It seems more like this is a case of you specifically not liking the character and making your own judgement as to what happened. Tim Drake is still a fairly popular character, he may not be as popular as he was fifteen or twenty years ago, but then there's been some fairly bad decisions on DC's part to contribute to that...but that doesn't mean if DC invested some real talent into the character he wouldn't be as popular as he once was and maybe even more so.