TBH I think the whole concept of NCT was designed so the members would be more disposable...
I think sm will hold onto the current line up [the originals not members like lucas]
as we now know with other groups when one member leaves it like [to koreans] saying the group isnt stable
so i think members will hit a certain age or a certain point in solo career when sm will let them leave
I think there a set amount members who i think will be allowed to leave early
[taeyong mark jeno jaemin chenle johnny some others to lazy to think]
because they are all able to stand alone on other work
Taeyong & Mark will prob be more pushed for solo idol work
Chenle will be the lay of nct lets be honest
Jeno & Jaemin will be pushed hard into the tv world [well they already are but more]
Johnny is already more known as mc radio host etc over being in nct i feel