I don't think Trump is heading towards war in Syria; I think this was to pressure Assad or to keep him, as stated, from bombing his own people routinely.
This is more in line with the 12 or numerous times in the past 2 years, the Israelis have bombed Syria.
I don't think Trump will appease the Graham/McCain types.
And as many point out, we've been bombing ISIS and Al Qaeda already for some time in Syria and have some military there.