No, I don't believe Bitcoin is a ponzi scheme at all. And I really don't think my age is relevant, you either have arguments or you don't.
But let's come back to that notion of yours
> If you're always incentivized to hold something and never incentivized to spend it, it becomes more of an asset than a currency."
Let's say all you got is 10btc and $0 in your bank account. And you need some food. You're probably gonna decide not to starve yourself to death because being alive tomorrow is more valuable to you than having more money and being dead. Thus you are going to spend your bitcoins (either directly or by exchanging them into fiat).
Now, what you probably wouldn't do is buy something you don't really need or want at the moment. And that's fine, in this case Bitcoin encourages responsible spending. Now, of course, you should understand why a deflationary currency grows long term - not speculation, but new products and services in the economy. If no one spends, then no new products and services appear, currency is not gaining in value. If it's not gaining in value anymore you have your incentives to spend back.
The major differences with a deflationary currency are this:
1. No one forces you to spend (like governments inflating your money), so you make decisions on your own.
2. Deflation is an ultimate tax that rich cannot avoid. If you make money, you will inevitably share it with the rest (their money gaining in value).