Will playing football hurt his opportunities because he plays football?
It's not an easy question to answer because it all depends. In one sense, yes because in the late summer early fall he will not be attending a place, a showcase, a college camp or a tournament that he could be seen at. That is obvious and probably why you ask. I have had teams that I coached at the PG Kernels Tournament and had players recruited out of that tournament as we had many coaches attend our games and that is during the football time of the year. The other aspect is always, how talented is your son. How hard will he have to work to be recruited.
Having said that, if your son likes to play football, let him play. If he is a football player that contributes on the football team and has a desire to be a part of that experience, its hard to take that away. Those are times on the football field that he will cherish. Just make sure you do your due diligence in the summer and maximize the baseball time he has to exposure. Don't make it a baseball crap shoot. If he has an idea of where he would like to go, try your best to get in front of the coaches in a tournament, camp or showcase and get your answers. Have your son stay in contact before and after he has been seen by the schools he targeted. There may be a good chance he gets his answers on where he will end up before football season gets going and he would be set for college baseball and not have to worry about missing fall baseball stuff.
How do college baseball coaches look upon a kid who plays 2 sports as opposed to just baseball???
Positively, if they are good and could help their team. Some coaches go out of their way to say they love multiple sport athletes. Some are indifferent. But I have never heard a coach say they dislike a player who is a multiple sport athlete.
In the end if he could swing both let him do both. I have recruited baseball/football players and we understand if we have an interest in a baseball/football player we get out to see them during HS season or summer season. In the past I have coached players who were multiple sport athletes that were highly recruited and it worked out for them without a hitch.
As a side note the most frustrating portion of doing both for players and parents that I know that play football and baseball is when the football coach in HS makes it mandatory to attend summer football camp and or 7 on 7 when the player has a baseball camp, showcase or tournament they need to attend and the football coach doesn't understand or care for the importance for that player to maximize that baseball opportunity and miss summer football practice. At times I have heard football coaches that give ultimatums of be here at football or else, and they are surprised when the player picks or else and is no longer playing football because the coach made him choose. Hopefully that will not be the case for your son. Good Luck!