Arsenal down and out?

Bad news from North London with Cesc suffering a ligament injury causing him to potentially miss up to 4 months. Ugh. Does this spell the end for Arsenal's quest for silverware this season? The Gunners were already desperately thin in the midfield and losing their best midfielder will not rectify that situation. Will Wenger go out and buy a replacement? I am sure he will look for one but who is out there that is an equal replacement? Here are some ideas...some are off the wall I will admit:

• Sessegnon from PSG. The Benin midfielder is very versatile he can play the #10 role or lie deeper to sit just in front of the defenders. PSG just bought him over the summer transfer window so not sure they will want to see him go especially since he is a key to PSG's turn around this season However PSG is under a tight financial situation so if the price is right, they might decide to allow him to leave. It was rumored that Wenger was looking at the player this summer before he left for PSG so it is clear the interest is there. Could the Cesc injury be the motivating force behind going out and purchasing the player?
• Toure...Yaya that is. Arsenal has always been linked to the international midfielder. Would Wenger go out and pay the money necessary to secure his services? Barca is leading the league in Spain and has a chance to capture another Champions League title so they might be hard pressed to allow their midfielder to leave, plus he would be unable to play the Champions League for Arsenal.
• Here is a crazy idea - Vieira ... Pat has never been the same since he left the Gunners. Rumor is he is breaking down under the difficult training tactics by the Italians. He is also being forced to play out of position - wide and not in the central role he excels at. Could he be had for short money? Allowed to come back to the club that made him a star? Crazier things have happened, but he could be a good stop gap for the rest of the season.

Wenger seems to believe he has the necessary resources within his own club already, but I doubt that since he was thin with Cesc...without him it is almost disastrous. Come on Wenger show your genius talent assessment again this transfer window!