Philbky, the RJX development was funded by Honeywell to gain the C of A for the AS977 engine. BAE cleverly didn't put their hand in their pocket....until the project was cancelled when they had an out of court settlement with HON.
18 a year was the target out put for RJ and RJX at Woodford. There were never plans to increase from that. As to BAE management mind set well, given that Bhutan Airways ordered 2 and Flybe ordered 8 (I think) with both trading in their existing fleet of 146/RJ aircraft I think they got it right to stop the programme?