Improving a football team should be the same as with any other business. Hold onto your best performers, get rid of the under performers and replace them with better. In the case of SUFC that should apply to playing staff, management and all other aspects from media to catering and back of house processes.
Sometimes other businesses would need to let go of staff for monetary reasons, especially if they are faced with the short term nature of contracts. We can’t force players to stay and accept deals if they try their luck elsewhere. Also, other businesses generally wouldn’t involve writing people off or getting rid of them so quickly, and certainly not after a few months of meaningful work.