S@W
As has been stated elsewhere in this thread, there has ALWAYS been a 'through put' of pilots to the long haul fleets. Why - because it suits some folks' lifestyles, family commitments and ambitions. If bmi long haul had developed without 9/11 then maybe there would be very experienced people clamouring to join us!
Perhaps ambition is more applicable to Oxford students who have demonstrated their ability to fast-track into the aviation world. Even so, your 5 pilots out of eight must have been with the company for at least five years to have TT of 5000 which is a good return for the company - considering these five only represent 1% of the work force.
As to your own concerns, if you don't like then follow those to BA and VS but watch out for the 'greener' grass
Anne