Capt Pitbull, sir!
I believe CF is being integrated into the EOG operations. As such, the bidding system doesn't have as much of an effect as it does within 'mainline' operations, the rules are somewhat different - don't know how exactly as EOG isn't my area, but I believe for some time you won't notice much change. As I understand things, everyone at CF will be 'frozen' on type(s) for 5 years which will preclude any sudden change to your lifestyle.
I shouldn't worry too much about people bidding onto the RJs ahead of you. People with about 3-4 years seniority can get commands on 73's etc. The cadets with this level of seniority don't have enough hours for a command so tend to bid onto the '400 or 777 since most of them want to try longhaul after several years flying out of LGW. By the time people get around to bidding onto the CF fleets you yourself should have enough seniority to have quite a nice lifestyle thank-you very much!
In other words, don't sweat it. There are plenty of opportunities in BA to do pretty much whatever you like as long as you have the time left in your career. I certainly won't be in any rush to go back to a SH command I'm quite happy going around the world playing golf!
ATB,
Underdog.