Since this thread is now famous, my prediction:
Michkov: Top 2 NHL'er of his generation. Could end up the best. Will lead the Flyers to at least one Stanley Cup and win at least two Hart trophies, along with at least three Rockets. Will be recognized at the end of his career as a top 5 Russian player ever.
Demidov: Will hit 100 points 2 or 3 times. Will be right around 1PPG for his career and probably around 1,000 games. Will have a few seasons as a top 5 winger in the league. Might contend for a Hart his best season, while being known as a first line winger for like 10 years.
Michkov with a clear edge in his career over Demidov, but Demidov will be a very good NHL'er player also.
Go ahead and laugh now. You won't be doing so when people look back on this thread in 20 years.