I have a few problems with this.
1. It's verifiable only through cryptography, so as I understand it, you can't verify on a block chain what is happening - sorta like Monero. If there is a loop hole where people can create more coins or cheat, it will be hard if not impossible to see.
2. Who is going to run all these new full nodes? Bitcoin already has a problem with node decline and now they want thousands more? Unless they do like Dash and incentivise the nodes, I see trouble ahead, and probably centralization to make it work.
3. Right now it's not secure, so make sure you don't try this with anyone you don't trust!
So is it a threat to Dash? Sure it is! Good to have competition, but in this area, Dash is so far ahead of Bitcoin. So in many ways, Dash actually has the first mover advantage here. I know people are holding back, thinking Bitcoin will have a better system, but really they are encumbered with a legacy system that they have to work around. Dash has all this cleanly and beautifully resolved, eloquently at the core. This will pay off big time, especially in cost. Just the fact that they want to have 2 networks will cost double to pay to use. Even if they manage to get a well distributed network going. The future of crypto currency will be competitive, and cost will have a LOT to do with it, even if it's cheaper than Banks to use.
I also question BlockchainInfo, and suspect they have an "in" where they will also be earning fees. I don't see this whole system being explained fully and have my suspicions.
"Thunder Network" is not secure yet and will undoubtedly be clunky to use. Dash is well on it's way to becoming a super easy to use system that is as familiar as existing payment systems. But they do have a TON of financing, so we're in a tight competition.
We've also been vetted over these past 2 years now. DarkSend works, InstantX works (excuse me, Privacy Protect and Instant Pay, right?)
They're just starting, and I'll bet they'll have quite a few hurdles and issues to overcome.