If your definition of a solution is "infinite scale", then it will never solve the scaling problem. In the meantime, potentially huge improvements in scale from raising the block size limit to much higher but still sane values, that would make Bitcoin accessible for everyday transactions for millions/billions of people, are not even being attempted.
In other words: even if raising the block size limit doesn't provide a solution for infinite scale, it could potentially still provide significant benefits, yet Bitcoin Core doesn't want to try it to find out.
In other words: even if raising the block size limit doesn't provide a solution for infinite scale, it could potentially still provide significant benefits, yet Bitcoin Core doesn't want to try it to find out.