Na, the shooting will be a small plot device in the grand scheme of things.
The shooting will allow Don Louge's part, the guy who's sister was killed to have more leverage with the bosses, and possibly bring the ATF, etc.... back in. It also allows Jax to have an out with the IRA, and subsequent war with them. There won't be a preachy anti gun tone to the whole season, just the next episode probably.