Spurs have no European football and they're already out the league Cup. They'll probably have 20 less games than us this season. If they're anywhere near on January 1st they should go out and sign a world class striker and they'll be our biggest challengers.
They haven't got the quality, depth of squad, or a star striker to sustain a title challenge. They won't be far off, but they will eventually fall away, after a good start.