3- till now, Bitcoins and other cryptos appears to me not as currency but as a bullion of gold, a bullion of silver, a bullion of platinum, an ingot of aluminium. It costs money to buy and keep, and it costs money to spend.
nearly 1 billion dollar yearly bitcoin payments/transactions only through BitPay disagrees with you:
https://blog.bitpay.com/bitpay-growth-2017/it doesn't get any currency-er than this.

Thanks, the link you posted I just read so quick, what it says is simply bitcoin adoption, use.. etc is growing and it is here to stay.
The point no. 3 is simply as follows:
How much would it cost you to pay in BTC only 10 cents to someone?
ignoring the months of May, June and August of this year (the severe spam attack) it only takes me a couple of cents (less than 10) to send a transaction. you can go to blockchain.info or any other block explorer and check the latest blocks to see the fees people pay for their transactions. ignore the first 10-20 transactions and look at the rest of ~2000. specially at the bottom you can see the 1 staoshi/byte transactions being confirmed fast and with high priority.