Since when has DAT (I know, it's SN Brussels Air....) 6000 employees? I guess less then 2000.. .You probably mess up figures: After the Sabena bankruptcy about 6000 people of the group kept their job, but they were divided at Sobelair, DAT, ground handling, ...
However, I believe it's a good thing SN did not merge with Virgin. Virgin says it had an increase of pax the last months, but that was only because they had little or no alternative out of Brussels. SN will give the high yield pax wath they want: a good service where they want to pay that little extra for.
PS: Is Virgin Express capable of CATIII approaches?