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It would be a long shot for bitcoin to shoot straight up to $2 million, yet it also is not beyond the realm of possibilties.
Shooting up to $2 million woudl be right around a 32x from here.
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This is a good example of how some metrics are not fit for all purposes. The multipliers, or percentage figures of changes in price in the past
are not in any way an indicator of what could happen in the future.
In simple terms:
even if you're making such projection based on past price that Bitcoin has attained, Bitcoin hasn't even reached that level in the past and in years to come, we will have to first of all see Bitcoin going past $100k to the range of $300k or $500k before looking at the $1M Mark for Bitcoin. Like sir J rightly said, those are not impossible figures but jumping from this spot to that height might look like we're not being realistic with our speculation.
Increasing your net worth from $1 to $100 is not hard, even a homeless junkie could do that without much effort. But going from $1 billion to $100 billion, or even just to $2 billion, is a whole different story.
I wouldn't agree entirely that your analogy suits the Bitcoin context and even with the general economic sense of upscaling from a $1 point to $100, I Believe it's always more deficult at the starting point than it becomes when you've witnessed some level of growth and have gained a wide range of trust accross the globe like what has happened in the Bitcoin scenario.
We've got to consider that Bitcoin has faced quite a lot of resistance on it way to this point and have gained a large form of acceptance which will play a huge role in it getting to whatever value any one is speculating out there be it a $100k value or even up to $500k or $1M. What's left for this sort of value to be attained is just a lot of big adoptors and a better form of acceptance by nations that are still skeptical about Bitcoin at the moment. Once these happens, Bitcoin will take a shorter time to climb up than the time it took it to get to this current value.