Economics played a part in it too. Joe was average over the course of it but was getting paid to be a top-tier QB. I think that is where a lot of fans started to turn on him.
Some fans take things way too far to the extreme.
However it was a business decision economics as you say, and Jackson earned the job. Wish Flacco the best. Thanks for the memories. But it makes perfect sense for the Ravens to do what they did.
He may not have been "wanted" at the very end with Jackson earning the job and the subsequent release/trade. But he was wanted on draft day. He was wanted the year before the Super Bowl but he turned down the extension. He was wanted to the tune of highest paid ever. He was wanted again with an extension after three years of a six year deal. He was wanted for 99% of the last 11 years.