I am not sure if I agree with this logic. Monero may be the best candidate to fill this market at this very moment but I hardly think that "something drastically better" needs to be "invented very soon" to avoid making Monero domination the "most likely outcome".

I don't think the very soon requirement is necessarily required (we are probably many years away from that much wealth being moved to the blockchain)

I am also not sure if "drastically better" is a requirement to surpass Monero either. Better marketing could be enough for an inferior technology to become the market leader if it is deemed "good enough" and gains critical mass before Monero.

I am optimistic about Monero but I try to temper that optimism.