Speaking of a Silly Poll

[Tuor in Gondolin]

we only see Aredhel as one representative of those who might have felt restricted, but it is likely that there would have been others who wished to go beyond the walls of the city.

Indeed, I believe Maeglin drew his followers from these types of elves,
which was the proximate cause of the fall of Gondolin. An
interesting problem of Gondolin in general, the elves come back to Beleriand
(seen in Galadriel's view) as much as anything for travel, adventure, etc.,
but then the Gondorians have to hide in a much smaller area then
Valinor for their protection.

My impression of Ulmo's thinking was that the Gondolin elves would stay
there as long as possible, then when necessary leave for the south
(the island of Balar?) and wait for the valar to decide to intervene.