Well over taking Monero or not without a doubt there can be a coin that is more private. Monero, Zcash, Deeponion, Beam, Grim all are in the race of perfecting privacy.
A new coin won't just overtake Monero overnight but say if a Monero user is to find that there is another coin that offers better privacy why would they stay with Monero other than for speculation perspective?
The goal isn't to have a bigger market cap but to offer better privacy. Even if a small user base is there to start with at least that small user base is getting better privacy than the larger.
Remember the saying quality over quantity most people in the crypto world just want to make a quick buck but I do not think that is really the customer base that one would want when having a high quality product.
A lot of project claimed if they are monero's competitors,, even better than monero
But until now, i still believe if monero is the best privacy coins my friend
Regards
Of course right now Monero is the best privacy coin, Scroda is still gathering team members and trying to develop a product but the concept is there but when Scroda does come out it will be more private than Monero and be Fee-less on top of that.