I was surprised to receive an invitation to be a dev, mainly because I don't have nice things to say about PoS (Notwithstanding that I have zero experience in software development, and limited knowledge in most programming languages.). PoW has it's problems but it solves a large range of issues that the PoS community are usually oblivious of.
1.) DoS resistant
2.) Free Entry
3.) Trustless
4.) Temporal (Monodirectional)
5.) Irrevocable (resistant)
PoW discovered for the first time that we can arrange information along a path of unreproducable work, and in that manner make the information it secures irrevocable without requiring any trusted party. That technology, to this day, has found no replacement.
I disagree, however, with the idea that altcoins damage Bitcoin or the cryptocurrency space in general. Markets naturally cater to multiple feature sets when there is no apparent ideal, as is the case now. Having more experimentation and options is always good for any market that will bear it. The only way altcoins will stop is when a cryptocurrency is found that has no conceivable successor in any niche. So if that outcome is desirable, it's furthered by more innovation, not less of it. If history is any indication, then we know humans are extremely iterative and innovate best in plastic environments.
So I wish you the best of luck, even though I think you're misguided.

I also wanted to make sure I'm not being misunderstood. When I'm pessimist and/or critical about Bitcoin, it's not because I support PoS.
https://download.wpsoftware.net/bitcoin/pos.pdf