Yeah, if all other capabilities can be back-fitted ... why not do so? It will be a long while before the whole fleet is procured. Of course, that whole connectedness and battlefield SA was a prime feature of the Army's Comanche and Force XXI ... and we see how that ended.
Originally Posted by
KenV
F-35 Marks New Era For Stealth
Aviation Week.com 08/05/2016
Author: Lara Seligman
The Air Force’s eagerness to send its shiny new fighter into battle is a marked shift from years past, when deploying the radar-avoiding F-22 to the Middle East was viewed as provocative.
With all due regard to Ms Seligman's efforts at reporting, "shiny" isn't what the F-35 is all about ... quite the opposite if one reads the sales brochures.
(Still not sure if one should lease it rather than buy it ... "if it floats, flies, or f***'s, lease it don't buy it!" 
)