I also think these layer 2 projects failed to solve the problem they promised to solve right now. It's still pretty expensive to interact with smart contract calls when I use Linea, not sure whether they have a plan to fix that or not considering how often they farm fees. If there are no airdrops or something similar I'm sure these projects will die quickly. Then again there's a chance they will introduce a new trend to make their project stay relevant, with how easy it is to spam ads on Twitter right now.
I think Optimistic Rollups Layer-2s are working quite well and providing users with a much faster and cheaper experience than Ethereum Layer-1. Optimism, Arbitrum, and Base can really support the development of Ethereum's expanding ecosystem in this cycle, so that Ethereum can focus on larger goals like tokenization.
zK Rollups still have many problems to solve, and this is completely normal because it is a new and extremely complex technology, to the point that Vitalik Buterin has also confirmed his concerns about this issue. I think we can only expect this technology to mature in the next cycle, and in this cycle the Layer-2 trend belongs to Optimistic Rollups!