But why store value in Bitcoin? What makes it so appealing? Id say that even Steem could have that function through powering up even better then BTC.
Anything really can be a store of value and the only appeal BTC has over other alternatives is that its "best known", "biggest"., limited supply.
Once more people start getting into crypto realizing the options available it could easily happen that BTCs appeal might be lost in favor of technologically superior crypto of which there are huge numbers already.

People tend to act as if BTC has some kind of predestined place in the future of money and that place cannot be taken over by anyone.
I dont hold that belief and i think that something that doesnt have a potential utility outside "hodl it might go up/hodl it might not lose value" is something that doesnt have a bright future. It might do well in midterm but without major improvements BTC is almost a burden to Cryptocurrencies and a go to crypto when critics want to spread FUD due to BTCs complete lack of ability to compete in utility with any legacy payment systems.

If STEEM had a bigger market cap (that it deserves) i would even say that it would be a far better store of value long term (if in SP) then BTC, even with the inflation aspect.

The main reason im a huge believer in STEEM is because it has the potential to be "everything".
And by "everything" i mean exactly that. You could actually build a whole society on the STEEM blockchain.
It does sound far-fetched but its really not. Look at what you have right now.
You have artists like me providing entertainment, you have fundraising, games, people offering all kinds of services, buying and selling rl objects, even a bank (of sorts), supportive and active communites that function on-chain, humanitarian efforts and most important you have SBDs and STEEM as the currency. All these things happening on the blockchain.

I respect BTC greatly for what it did but i really cannot see what the appeal is now that i have found STEEM.