Calm down
No one wants Jet*to fold nor will it fold ...it plays a role in domestic aviation.
Its requirement in the international arena is yet to be proven.
It has been said ad infinitum that LCCs survive in an environment of comparatively low fuel cost.The model is predicated on that and lower wages than legacy carriers.
When the fuel cost changes so does the business model..ie they are no longer LCCs.
There is a place for the business model but only in a particular economic environment.
That environment is shifting