PS: Why doesn't the Bitcoin network just increase the block size to 1 TB and change the block time to 30 seconds??? (Or just make it like Litecoin?) (Or make it Proof of Stake?)[/color]
Block size increase requires a hard fork which you'd never get consensus on.
Increasing the block size means less people can run a full node, which means fewer and more centralized transaction validation, plus increased costs and bandwidth and more centralized miners. Result is you'd end up with much more centralization and would no longer have a
censorship resistant currency.
Additionally you can't just keep increasing the block size to fix the scaling problem.
It's the law of diminishing returns.
Proof of Stake will never happen with bitcoin.
It's way too a radical departure from Satoshi vision and brings new network threats.
Layer2 scaling solutions are the chosen way forward, Lightning Network.
Plus SegWit opens up a lot of flexibility that will reduce costs, but their seems a conspiracy of exchanges and wallets not to create SegWit addresses (like blockchain.info)