Well, we have the Fundamental Problem of Space Games: space is really big and really empty, but if you make it smaller why did you set the game in space in the first place? Wherever the compromise is placed will make no-one happy.
Perhaps he will then remain there for a year or two and a new third bubble of civilization will build up around him!
I'm unconvinced that there's enough interest in the player base for a third bubble. Well, maybe some of the idealists from Colonia who don't like the way it's developed? But they could occupy any of the existing lone stations out there and get started right now if they wanted to... Crab or Omega Nebula, perhaps? Mostly they were opposed to organised groups of people, so perhaps they already have done that and just haven't told anyone?
Colonia has - well, it's hard to estimate and only Frontier really knows - somewhere between 1% and 3% of active accounts would be consistent with the evidence (and I'd guess under 1% of primary accounts as permanent or semi-permanent residents). Those are probably the accounts most interested in being outside the Sol bubble at all in the first place. Create a third distant bubble, and it'll split that 1%, but probably not attract anyone new much - and Colonia already has too few people for the number of systems.
But why should it end there? Colonia has grown, it is becoming less of a frontier, and more a corner of civilisation. As with the real world when new settlements become thriving areas of business and activity, they ultimately become better equipped with ports, docks and airports. They become easier to get to.
Between 1.4 and 2.4 optimised jump ranges will have gone from ~40 LY to ~280 LY - seven times faster. The "become easier to get to" has already happened, by most of an order of magnitude.
Of course, it's still not enough - there's always complaints when there's a CG in Maia, which is basically close enough to the bubble at current speeds to not be considered a distinctive colony in the first place.
For 'easier' to be 'easy enough' for some we'd need drives with at least 100x their current range. So demands for ever-faster travel will be a permanent feature of Elite Dangerous. At some point - maybe we're already there, maybe not - Frontier will say "this is fast enough" and ignore the remaining demands.
This doesn't cheapen what Colonia is about, and it certainly doesn't make the game easier. Colonia is not just about "distance" and "time to travel", it's about the monumental task of players having created a new area of civilization.
Right. And why is Colonia a "new area of civilisation" in a way that "the Pleiades settlements" or "New Yembo" aren't? Why was it a "monumental task" rather than a couple of routine CGs easily forgotten. Why is it still talked about and New Yembo isn't and Ceos is only talked about as a convenient place to get Fed rank? Because it's a long way away and so there's a significant barrier to getting there.
It's really unfortunate that the barrier is purely "time" - other more designed "new regions", perhaps in games which had intended Colonia from the start, might use "skill" or "money" or "equipment" to implement the barrier instead. In Elite Dangerous, unless exploration/travel suddenly becomes routinely dangerous and requiring of skill beyond mild concentration to survive 99.999% of it [1], it has to be "time".
But it needs *a* significant barrier or it's not actually a new area of civilisation, it's just a bunch of low-population systems on the 'edge' of the bubble with poor outfitting. There needs to be something which says "I am in Colonia; it will be an active decision with consequences to go to the Sol bubble" and vice versa. It's very unfortunate that crossing that barrier is solely a matter of time and patience rather than anything more exciting - but even so it's necessary to have that barrier.
[1] Only consistent way to do this I can see is to make star scooping really dangerous so you're dead if you mess it up and probably take some heat damage even if you get it right, but allow scooping much more safely from gas giants. Suddenly travel through unpopulated space becomes extremely challenging, and honk-jump risks missing the last safe refuelling opportunity you'll get. I'd be surprised if anything like that happened, of course - that would be a completely different experience and game, not to mention a giant and probably fatal shock to half the explorers currently out there...