SegWit is used to fix the network so Lightning can be attached later. Lightning allows you to pay Blockstream for transactions rather than the miners.
Please stop with the FUD. Lightning is not just being developed by Blockstream. There are already multiple implementations of Lightning made by multiple different teams, only one of which is Blockstream.
Furthermore segwit is more than just a fix for Lightning. It provides much more uses and fixes which have already been discussed in this thread and elsewhere.