How do you tell a job leads to dead end career? Seems that market changes and the dead end jobs can revive again

Looking at old posts, and it seems some of them became no longer relevant as market dynamics changed.

For example, energy team was once sucked as the less sought after sector but then recent the push towards renewables in last 5-10 years is so strong coupled with billions being raised in infra funds - shops like ISQ went from nothing to 40bn+. Stonepeak became a top tier fund within a decade after spun off from BX.

Secondaries were dead end as you cannot really jump back to direct investing - but then the activities and fundraising are so huge that it became quite a big asset class on its own. You probably promote faster than direct if you joined 5y ago.

Capital markets - I saw people exiting from ECM to IR or fundraising both within PE/HF and series C/D companies. Not the sexiest role but the market seems to be large enough to absorb the so called dead end career guys. Meanwhile DCM does not seem to change much -  markets within PE still belong to levfin guys