I don't think he was ready back then (not sure if he's ready now either), and he really should be playing week in and week out, which he wouldn't be able to here at Barca.
This season could be huge for him. He's settled now and will most likely be trusted to lead this Tottenham team which is desperately looking for an identity. Hopefully Pochettino will lock his position down rather fast, so he can avoid being thrown around all over the pitch like he was last season. Does anyone know how Southampton played last season, and where he'd be most likely to play Eriksen? According to Whoscored, last season they played with 3 men behind a striker, so he could probably play either of those as a AM winger or just a regular AM.