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Yes, there is nothing that would prevent this or give advance warning if that was the direction that the company wanted to take. (They would basically just announce that X version of the firmware would be the last open source version)
That said, this would be a major change and require a complete re-write of heaps of existing open licensed code, so it’s more likely that a decision like this would happen with a future device early in it’s development cycle. (Though this can happen mid product cycle, just like with Coldcard when the moved away from an open source licence)
At the end of the day, it isn’t really productive to speculate about what a company or may not do in the future, you can only buy it for what it is today.