Yep, the Yanks' farm system let them down last year - and yes the Yanks had a ton of major long term injuries to productive front line players last year.
Bottom line--> If it happens again (to ANY TEAM), the Yanks (and any other team) will be scrambling and struggling like heck.
No doubt the Yanks need Tex and CC to bounce back and be productive.
As for catcher, 2b, 3b,SS and the outfield, the Yanks appear to have decent depth with Cervelli/Romine/Murphy. Ryan, Nunez and Ichiro.
Every thing else being equal (injury wise), Yanks will need to adequately cover any TWO of 2b,3B,SS to survive in case of long term injuries.
Quite possible !
DON'T PANIC ! lol