I have a feeling he is going to be just an average NHL player in the future. Send him back to juniors. Should have been at the WJC.
Based on what exactly?
This year doesn't really say anything about his future at all. It could hurt him, it also could have no impact at all. Look at Joe Thornton, who had a very similar first season in the NHL, he turned out rather well.
He probably shouldn't have been in the NHL this year, but there is nothing about this year that can clarify what kind of career Draisaitl will have. Plenty of players with an excellent rookie-season crashed and burned quickly afterwards, plenty of players who had a hard time as a rookie or took ages to make the NHL ended up with an amazing NHL-career.
Fellow German Dirk Nowitzki had a very tough time in his first season in the NBA, showing little of what was supposed to be his strength, yet look at how that turned out, now he is the most successful NBA-player born outside the US in the history of the league. There are plenty examples of a player showing little of what he is actually capable of. Some never reach that level, others will reach it regardless of whether some career-decisions were less than ideal.