If there will be a Bitcoin 2.0 or a change of network from POW to POS then not only the network congestion is being fixed but many more, and also it can reduced the energy consumption.
Overturning the Bitcoin protocol is not a solution to high fees. Bitcoiners use it cause of the value it has and much of that value cmes from the security the network has and how decentralized it is, changing that up will make it just another altcoin out there.
Off chain channels now seem to be the best option to transact with less fees at the moment. In the future a better solution ma be implemented.