My daughter is also a Dec birthday and it's much harder for her as well being youngest on her team. However, this should not impact how much playing time any kid has on a team. We've played for 2 large clubs in NOVA and quite honestly, I would have a fit if she did not play at least 1/2 of a game consistently.
She's been the star of a team and she's been on the bench of a team - she's U13 and 11 right now. I suspect your son if 9 is U11? At that age, it still is developmental but important he is allowed more time and I do think moving him to a larger reputable club would have that happen. Arlington, Alexandria, McLean, BRYC, they all do a good job rotating kids esp at 7v7. Once you get to 11v11 it may be a bit dicey depending on how large your team is.
U11 is more or less a kid playing at least all offensive or all defensive - they may switch your kid to 2 positions but my daughter who played 6, 8, 10 experienced the opposite prob of playing defensive at U11 along with all the offensive positions in a game - she could do it and nobody else on our team at U11 wanted to play more than 1 position so on that note, I don't think it's a huge deal for your kid to play just striker. If he's only playing a few minutes per game, keeping him in one position is probably best as well. It depends on whether or not he feels he's in the right place at striker v. midfielder/defense of course.
I would talk to the coach for this season and consider changing next season. It's not too late to continue developing at U11. I don't agree that Travel is a racket unlike PPs, if you pick the right club. On rec, they aren't actually going to approach playing in a formal manner. Let's face it, rec is fun. You can get better at playing but it's totally informal.
I can't even watch my other kid's rec game - I mean of course I do but it's night and day from a travel game. Rec players do not understanding positioning/spacing at all. It's a totally different set up. My travel kid will play soccer in MS school and she doesn't have to work and can score 6 goals just touching the ball. She's not ECNL but she's pretty high team but just saying, after 4-5 years of travel, she at least has a strong foundation I doubt rec would have given her.
She is not after being pro for sure, and we're not looking for that. But in terms of understanding the game and playing to the best of her ability, travel is where she should be. It's the difference between studying under a teacher and playing yourself. At a certain point, unless you are a savant, the right teacher in younger years can give you a foundation to build. It's just worth it to know what the right way is. The competition I think is what drives my travel kid - it's fun knowing that you know how to play you know? My other kid who does rec could really care less about soccer and just wants to run around with his friends