I'm not best pleased that BRS-BRU is heading to Dash-8. I've rather enjoyed the pocket-rocket over the years.
LH (boo hiss) did say that they wanted to strengthen their presence in the UK regions, with more connections to *A hubs. Places like BRS, NCL, GLA, BFS aren't well served into the *A network. That might be an opportunity that BD-R might be used to work on. (Mind you, LH say a lot that turns out to be vapour).
From what I've been told, the 145's are profitable on BRS-BRU because they're low capacity and drive high yield. Having just paid GBP525 for BRS-BRU-BER and back, I can see what they mean.