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Scarcity of habitable planets is absolutely solvable with technology - space ships, stations etc. Sufficiently advanced technology may also allow people to switch to more efficient bodies, or upload their consciousness to computers, or simply different forms designed for 'uninhabitable' worlds, or space itself.

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One series (that I'll leave unnamed to not spoil anything) suggests that the limiting factor isn't habitable planets, but wars ended up being fought over limited availability of metal in the universe. You can build your own space ships and stations, but eventually the raw materials have to run out no matter what you're making.

There are of course other limits that may or may not be solvable, like most of that metal being stuck in relatively deep gravity wells. But it's still an interesting thought.

Maybe, of course, but we don't know that, that's my point :) There's also a question of costs, and artificial stations could be totally insufficient to sustain a civilization in long run.

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