While I can understand what you are saying, I think developer growth is something that will only continue to rise. Check out the recent Electric Capital Developer Report which shows increasing adoption of Move and Aptos by developers over time. I also made a topic post about this in the Development section of the forum.
In terms of cross-chain compatibility, the upcoming Lumio L-2 optimistic rollup by Pontem will support both the Ethereum Virtual Machine as well as the Move Virtual Machine, which is what Aptos uses, allowing Aptos to process transactions that settle on Ethereum. As per the development documentation, developers can deploy their EVM or Move VM codebases in a few lines of code with some more effort needed to enable cross-VM calls. For data availability purposes it could integrate with platforms like Aptos. Read this great article from Pontem to find out more.
Movement Labs also announced in Nov 2023 that they were going to be building a Move Virtual Machine L2 for Ethereum called M2 utilizing Celestia for data availability. The goal is to bring greater adoption to Move as a programming language.
Even though Move is a newer programming language compared to others, solutions are being developed that will make it more interoperable and utilized so it’s not on an island per say, as you stated.