I'm in the same boat.  While happy with AT&T now (had to go through 3 HD DVRs before I got a solid one), I switched last year (from Time Warner) on the assumption that U-Verse would cover the Padres.  If AT&T doesn't pick up FSSD, I will definitely switch back after my current agreement expires.  I'd be shocked if they didn't pick up FSSD, though - seems like a no-brainer.