Schnorr is a softwork not a sidechain, and most important Rootstock is almost out and is in beta right now which is the last testing phase.
Rootstock has been in development for a very long time, and will bring Ethereum to the bitcoin. Which means Ethereum prices will drop
drastically.
More projects will come for 2018-2019+
You need Bitcoin for the use of blockchain, Bitcoin is the payment app. You can make alot of apps for the blockchain, you can also call these
apps sidechains, or 2th/third layer and drivechains. Bitcoin can only go mainstream with these sidechains forget blockchains.
Bitcoins potential is very huge and for sure can replace the monetery financial system. I don't know how much % but 1% penetration will make
btc 100k+ for a coin.
https://media.rsk.co/rsk-brings-the-new-evolution-of-bitcoin-reliable-smart-contracts/
moreover that at this time a lot of ICO with the better technology.
it can bring about a significant change in this blockchain technology.
great potential will always be in bitcoin even bitcoin can have clear legality around the world.