If it all goes as bad as you say I wouldn’t put too much faith in your 10-15 years seniority, the courts will tell you LIFO in isolation (as far as Europe goes anyway) is dead in the water as it’s tantamount to age discrimination. Not only that but good luck getting an airline strapped for cash to shoulder the bill of retraining virtually the entirety of their remaining seniority list. What you’ll be seeing is redundancies by fleet and by seat, your position on the overall MSL will be largely irrelevant to this process. It will be dependent where in relation to the rest of the fleet you sit in your respective seat and even then it won’t be pure LIFO as it will have to be done within a matrix that encompasses other criteria.