First you cannot dump a union. Nor the seniority list.
Look at Jet Blue, they just got a union because management forced them to.
If upper management thought differently then you wouldn't have a majority of problems we have today. Also the top end of pilots might have room to come down but remember a vast majority of new hires have zero jet time. Zero time at flight levels, some have zero actual instrument. I have flown with plenty of pilots that flew their first "Down to mins" at the airlines. First year is more like an apprentice. Not always, but more so than not.
Now if the airline management would put their employees first then their suppliers, your customers and shareholders will automatically be taken care of.
Problem solved.