The staff directly, and some indirectly, employed by the failed airline are out of work, been there, done that, got the tee shirt.
Handling agents do not quote airlines and/or employ/pay their staff on specific passenger numbers, on load factors, they quote and employ/pay on aircraft types and/or seating capacities, whether an aircraft is 50% or 100% occupied the same staff are employed/paid, likewise air traffic controllers, firefighters, runway inspectors etc. are not employed/paid per passenger, it takes the same amount of these personnel regardless of any specific load factor.
So it is not about an airport bettering a number of passengers statistic better than the previous year(s), there might be fewer aircraft flying around the UK skies this week than there were last week but the UK population hasn't dropped in numbers to reflect that and soon things shall recover whether the replacement aircraft be flying from BHX, MAN, EMA or wherever.