Super simple wallet. As others have mentioned it needs to be "Grandma friendly" to allow for an easier adoption rate. When one BTC was a few bucks people didn't feel so bad about messing around with $20 worth of coins to learn how things work with the client. Now a few coins is more than most people have in entertainment/play money set aside for monthly usage. The psychology of owning less than 1 of something combined with the high value of that one thing doesn't help us out. We are in an "uncanny valley" so to speak where the value is high enough to limit how much people can play around with it and the value is too low for it to be awe inspiring.
My idea for the grandma friendly wallet is something that can be easily setup on any device and allows some type of sync between the devices if setup on multiple devices. Not sure if this exists but 2 factor authentication would be a plus for security but doesn't really help the adoption rate by non-tech folks.
I made a small bit of $$ off some of the recent alt coin releases due to early mining. Right now there are too many coins going on for a new person to take it all in. When I am explaining the whole BTC thing to a new person who shows interest, I usually lose them somewhere around the alt coin discussion. We should be free to release whatever crypto coin we want, but I think we need to really move towards better coins and not just copies of the two main coins.
Mostly just some random thoughts to chime in
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