BMI are trying hard to reorganize the carrier, and its tough when you are losing money, but cant drop routes because of the strategic value to their owners (LH and SK).
The A321's are clearly too big for the carriers routes, with the exception of DUB and BFS, and the A320's are too big for LBA, MME, CDG, BRU and MAD.
Personally, I'm surprised that they didn't go for the A318's
The Embraer fleet has no home either, since EMA is now a 737 operation. This leaves them flying Jets into markets that really don't need the additional cost.
They also have major issues with the A330's - mainly that they cant get them into Heathrow, with the MAN routes not making money, and one aircraft fully mothballed.
But LH and SK are willing to take the financial hit for Strategy...
You are 100 times more likely to catch a cold on a flight than an average person!