"Light Account" is a dumb name
It's a GREAT idea, but the name doesn't work for me. Let's just call them what they are: "wallet addresses." Because that's what they are. They're just public keys, like a bitcoin wallet addresses, only it's on STEEM. I'm talking about how to describe them to non-STEEM experts. They don't care if named accounts also have wallets. They're not at that point. Once they build a nice balance and a good basis, then they might look into a named account.
These wallet addresses basically will look like this:
You'll be able to just generate as many as you want. More importantly, you'll be able to use a paper wallet that exists entirely offline. The decision to speculate on STEEM all boils down to how complicated the process is to generate a new address. Apps like @roelandp's excellent iOS wallet could generate these addresses too. So there's the possibility of a whole range of key management solutions, from paper-only to Steem Keychain and everything in between.
There's a lot of people who speculate on an asset based solely on the ability to a) make a snap decision and b) get that asset off the exchange. Without the latter, they won't do the former. Which means for 3 years, STEEM has been a no-go for that specific segment of volume.