You could argue that nothing really matters until 2 weeks time from now, when Chelsea plays Bayern Munich. And you'd probably be right.
But, the Premier League title is still up for grabs (City visit Newcastle first - tough! - while in the late game United are home to Swansea - unleash the McEachran, please?!) and the relegation battle is just hotting up.
Mathematically, Chelsea are STILL not out of the race for 4th place so if you care about that, you should be rooting against both Spurs and Newcastle...should they both win, Chelsea would officially be "reduced" to having to qualify as defending champions for next year's Champions League...