I think you haven't been following the scene very closely.
There's already multiple solutions to these problems. Take a look at RaiBlocks (raiblocks.net) for example, which has instantaneous zero-fee transactions with very high throughput (hardware limited) without losing decentralization or other security properties (not proven atm). RaiBlocks uses delegated proof-of-stake with a block-lattice architecture.
Another example would be Cardano, which has the first provably secure proof-of-stake protocol with same security guarantees as Bitcoin, and is also secure in a scalable setting with blockchain sharding (as is planned in Ethereum too). Proof-of-stake doesn't require energy to mine blocks and can be scalable but is very hard to secure.
There's multiple other solutions as well, such as IOTA, Byteball, Steem, BitShares and others which might be more centralized and less secure to achieve scalability. Then there is Bitcoin Lightning Network almost ready, and also MimbleWimble coming out soon (http://grin-tech.org/). Lots of things are certainly happening faster than you can anticipate.
Additionally, there's projects like Enigma and Aion, which add scalability, privacy and interoperability on top of existing blockchains. This territory starts to get a bit complex for me.