Every fully decentralized coin hits at an early point the ceiling and won't scale. Vitalik Buterin expressed this recently. So, why should XMR be faster?

Besides, the anonymity is nice but just pipe your <put any coin here> through some random exchanges and you have the same effect, so it's really not that killer feature to create a new huge ecosystem. I like XMR's tech a lot and I think it's not too bad to have XMR in your portfolio, the question is if it has the potential to be one of the next major coins in the long-term (3-5 years). There, I rather see other candidates with a much higher probability, there is just too much good competition which came up the recents months/years.