"My opinion" can only be defined as "my estimate of the probabilities of various scenarios", and Expected Value can be calculated out of it. The problem with this approach is similar to someone asking a poker player: "What is your opinion, do you win this round?" Poker is not played out of opinion, but out of rigorous mathematical probabilities, coupled with psychology concerning the read of the opponent. Predicting the prices of Crypto is even harder since there are no rigorous probabilities that all would agree.

That said, I give about 50% chance that XMR will totally fail (be valued essentially at zero) in 2-3 years. The other 50% would be about:
- 10% valued at the same as now
- 10% valued at $1
- 10% valued at $2-5
- 10% valued at ~$10
- 10% valued at much more.

I cannot really give estimate on DRK. It currently has a higher marketcap than XMR but I haven't invested anything in it. I am not against premine but the way DRK is presenting theirs is unethical to my standards.