In terms of quality, Chelsea are still ahead of Spurs for sure. Chelsea have problems at the back, but at least they don't have to rely on a pensioner like Gallas at the back. Lloris is a very solid keeper otherwise, and they'll be stronger once Kaboul returns. Once Chelsea get Falcao as well, you can forget about any troubles finishing off chances. Flair wise they are far ahead too.
As for us, there is very little that can be done. We have been the same since we last won a trophy, always maybe 2-3 really good players from seriously challenging for the title, and since we won't get those players we need, we'll remain that close for quite a while.
Hence why I reckon it's time for Wenger to go, he is an enabler, the board will have to fork out if a lesser skilled manager comes in. Also, guys like Ramsey and Diaby are quality players, but we can't afford their development/injuries ruining the team's prospects.