The most optimistic is pretty damn broad. How about Bitcoin tears itself apart with the bullshit over the block size or some other political crap, LTC is gone by then (could happen within a few months in my view), and Monero is the most credible PoW cryptocurrency project left standing (some of the less dysfunctional Bitcoin developers would likely join and we would welcome them), which then takes off globally within 3-5 years for a valuation well into the trillions. So yes, that is 1m or more.
Before I'm accused of being a pumper, I'm not making a "call" here, but you asked about most optimistic. Honestly I'm not even sure I reached it. I may not be creative enough.
Yeah, I was curious what aminorex was thinking of when he typed that, but I'm always happy to hear other people's insights on this, and from all my reading this past month on crypto in general and monero specifically, I've kind of take you as a somewhat authoritative person on the topic, so thanks for your input
For me, I'm not sure what a "most optimistic" scenario would be, but I think a somewhat "realistic most optimistic" hope is that Monero increases 100-200x on BTC, so to about 0.2-0.4BTC/XMR, and BTC goes up by about 100-200x, bringing the total to 10,000-40,000x current value.