The real scalability solution isn't creating a new side chain or using the other chain and re-brand it with new names.
But the real solution is how you can convince people to use the chain as there are a lot L2 and side chains out there e.g. Lightning network, Liquid network, Rootstock, Omni layer etc. Until now, only small circle is using Lightning network, while the rest, almost no one use it.
the first solution to the convincer conundrum, is have these subnetworks actually do as promised. but even before doing as promised they need to function securely where there is no scheme, scam, or bug that can lose people their value.. in short needs to be secure and satisfy a need.
which the current generation of subnetworks do not achieve.
bitcoin will eventually have some subnetworks that populate due to having niche utilities that fit peoples needs. but that will be some next-gen subnetworks. where devs learn from the mistakes of the current gen subnetworks
currently devs are too busy just trying to do work-arounds and then adding in features they think people want to hope it grabs peoples attention to move over to their subnetwork. but they still are not fixing the underlying flaws, so eventually even if feature rich, users will still want to wait for new next gen subnetworks that actually do as promised securely without middlemen/bottlenecks/bugs/flaws/annoyances
side note. OP's altcoin promotion(whitepaper) is just a jumble of different existing altcoin models that use sidechains/subnetworks, (multiple mixing of different buzzwords) but doesnt actually solve the bugs/flaws/annoyances experienced by current gen networks that use subnetworks