Look at how cheap the fees in the L2. How can we need L3 if there are so many L2s available in the market? Are you sure those blockchains will be invaded by human then they will be congested? The list are containing a few L2s. There have been so many new L2s still ted from that list like manta or even blast.
L3 is not even needed. It is being created as the purpose of making money only. There's no urgentcy to create L3 blockchain. L3 is only for grab your money. L2s are enough.
Of course it's a cash grab. Developers want to make hype just to fill their pockets with money. L3s aren't necessary, especially when L2s are still fast and cheap to use. I'd imagine layers built on top of others to remedy long-term scaling issues. So we would have L1s, L2s, L3s, L4s, and so on. All of this complexity will eventually confuse people. Especially those who are new to crypto/Blockchain tech.
Pascalcoin's (PASC) "Safe Box" mechanism already solves Blockchain's scaling issues. This eliminates the need to build additional layers. If developers from other projects used this tech, all of our problems would be solved. They won't do it because they want to keep filling their pockets with money. Just like how ETH devs are forcing users to move to centralized L2s networks instead of dealing of with on-chain issues first (increasing transaction capacity, etc). When will we learn?
