Gas fees will always be a problem.

As a blockchain grows so does its usage and strain on the network. This inevitably leads to higher gas fees as block space becomes more sought after. The more decentralized a chain the harder these are to rein in. Even centralized chains face these same growing pains as seen by Binance Smart Chain (BSC). Ethereum and Vitalik seem to feel that sharding and Layer 2s will be enough to take away strain from ETH mainnet. What is also interesting is what the layer 2s are doing to combat their own rising fees. Matic/Polygon will be using ZK rollups and bought a start-up that has experience with ZK rollups.

And then there is Avalance