You make a lot of great points and I share your bullish views. I sometimes read facebook comments about cryptocurrencies and I realize that there are so many potential adopters who are just held back by randoms warning them to stay away, sometimes even without making an argument, other times by presenting ridiculous claims.
I also see a lot of people who are concerned with the lack of usecases for these currencies, but at the same time, I'm delighted to see that cryptocurrencies are working the go-to person-to-person payment solution on the internet, particularly regarding donations.
I'll check out blocktivity.info. It looks really interesting.
Disclaimer: I will not use this post as financial advice;)