because it's fast and the people wants a "normal" e-currency with instant transactions. 
This. It is literally that simple - people just want something that works well.
Because of the quick blocks, they arn't going to experience network congestion. Yesterday there was a period where just one bitcoin block was found in an hour, which increased the backlog. With Ether making blocks practically every minute it's not going to happen to them. And all the end user cares about is whether something works. They don't want to hear excuses or explanations about why their transaction hasn't gone through. They just want stuff to work.
So what is going on with the development or the push for Bitcoin thunder network now? The last I read, the thunder network is going to try resolve the problem of network confirmation.
It is too little too late. The lightning network is a last ditch attempt to save Bitcoin. I am simply not convinced it will come out early enough and even if it magically gets released next 3 months it will have a slow adoption curve. At the same time, ETH is making incredible progress not just as a currency but in all sorts of areas.
This risks that Bitcoin will drop in half are considerable and thats a risk I am not willing to take when there are coins with a more promising future.
The last code check in is 7 days ago. At least it's moving. lol.
https://github.com/blockchain/thunder