What makes you say that? Tanks will just blow off some bridges and there will be airstrikes and that'll be about it.
I doubt that Israel will invade Syria.
It was my first gut instinct. I think it will escalate into it. If they do not hand back the soldiers, Israel will put pressure on Hizbullah by bombing positions in Damascus and possibly even Tehran. It is pretty serious, Israel don't take these events lightly as we all know. It is only my prediction.
Israel Invade Syria - certainly not - bomb the cr_p out of Damascus which is world headquarters for the Hamas god-fathers and most other global terrorist organizations - very likely IMO