the devs still haven't solved most of the scalability problems
I used to think this way until I realized it's wrong. Bitcoin has no scalability problem at all. It's not meant for small everyday payments (at least on the main chain), it's meant for things like capital preservation, portfolio diversification, and being able to easily transfer or transport large sums of money. For those things its current technology works perfectly well. Being able to send $1 billion anywhere in the world in less than an hour for a couple hundred dollars of fees is absolutely fantastic.
There are no fundamental factors for longer term growth.
There are MANY. The simplest fundamental factor is BTC slowly but surely replacing gold as the preferred protection against rapidly increasing currency debasement around the world.
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