Wax? Telos? WORBLI? Are you scared that these are going to take away from your investment in EOS? Don't be. At least, that is my opinion.
Let's go by an analogy to how the Bitcoin project actually benefits from the progress of Litecoin and other copy pasta coins.
Interesting thing about sidechains is that they can be compared to all of the blockchains that were built on the same codebase as Bitcoin. Litecoin is almost a direct copy of Bitcoin, with a couple of modifications. Once Bitcoin was up and running and especially since it had huge sums of money thrown at the network... it had to develop in a more conservative manner. It needed stability and the devs couldn't be scrupulous; they had to take into consideration how every little change might affect x y z.
Litecoin and other Bitcoin spinoffs could experiment more. They could be crazier and adopt wild ideas. Whereas Bitcoin had to remain "boring".
Because of the similarity in the codebase, Bitcoin could often directly adopt the changes made in Litecoin, etc. once these had been proven to work/improve upon something. Every single Bitcoin replica that made changes to the original code became testbeds for the improvement of the original Bitcoin project.
Sidechains are also evolving more frivolously... they are making changes to governance, to inflation and so on. The side/sisterchains that run on EOSIO software become testbeds for the first EOS network. Key difference being, that EOS was built with this is mind. We want as many competing side/sisterchains as possible. The Inter-Blockchain Communication (IBC) is going to connect all of them and they will all work together in unison. The exact opposite of https://en.wikipedia.org/wiki/Crab_mentality
In order words... The consensus algorithm "optimizations" made on the BOS chain aren't optimizations until they've actually proven themselves beneficial. When and if that happens... The EOS "Mainnet" can perform an upgrade with the same changes.
This obviously goes both ways. If something is done to the EOS chain, same upgrade can be made on any other EOSIO chain. The chains will evolve somewhat fluidly in and out of each other in an eco system akin to how Linux distributions also have a collaboratively competitive/competitively collaborative dynamic.
Now, back to coding.
via EOS - The Blockchain for Commercial Scale https://www.reddit.com/r/eos/comments/govga3/eos_only_grows_stronger_with_ever_new_sidechain/