So I'm not an expert in this but even with DeepSeek supposedly reducing training costs isn't the estimate still in the millions (and that's presumably not counting a lot of costs)? And that wouldn't be counting a bunch of other barriers for actually building the business since training a model is only one part, the barrier to entry still seems very high.
Also barriers to entry aren't the only way to get a consolidated market anyway.
About your first point, IMO the usefulness of AI will remain relatively limited as long as we don’t have continuously learning AI. And once we have that, the disparity between training and inference may effectively disappear. Whether that means that such AI will become more accessible/affordable or less is a different question.
Also barriers to entry aren't the only way to get a consolidated market anyway.