Could this be a fold?

[King High]

Down to 4. Pays top 3 1st 2000 2nd 1200 3rd 750. The blinds are 4,000 / 8,000. Sb is chip leader with 50/m Sb has 11,500 I am on the button with 19,000.

I get AJs the sb has been calling a lot and getting great cards and I figure the the sb will go all in either now or the next hand. Can you make an argument that it's smarter to fold here? I feel this hand is too strong to fold but I can't help to think that I should let the chip leader do my dirty work for me (I know he will call) and not risk 4th if the he calls my all in.