Though arguably that drive doesn't apply so much in the ED context anyway.quite the opposite for me, actually.
I always found it weird that the Bubble was more or less static (besides of changes FD generated) and completely ignored the natural drive of civilisations to push bounderies/expand...
- there are already more than enough terraformed ELWs to hold a population several times that of the bubble
- population in general seems to be stable rather than growing
- there is similarly no shortage at all of raw materials, food, energy, etc. within the existing bubble
With no motivation to expand for resources or living space any more, no major wars or natural disasters or advancing glaciers for people to flee, the main reason to settle becomes a political disagreement with the existing powers. There probably have been quite a number of those - but they've no reason to advertise their existence and a lot of reason to keep quiet.
(And in a meta-game sense: the existing 20,000 system bubble already has far more space than the player base actually needs for anything, so the main obvious consequence of letting players add another 20,000 is that everything gets more spread out, BGS state effects get less common as fewer systems get a critical mass of players, etc. Colonia has just over 70 systems and even some of them are rarely-visited enough to be somewhat superfluous, which is why its expansion stopped after a couple of years)