Arsenal's current squad can really challenge for the Premiership next season.
Coquelin has finally solved the CDM issue. Sanchez, Ozil (under-rated) and Giroud are all top Premiership players going forward.
The defence of Bellerin, Koscielny, Gabriel and Gibbs is solid and very suited to the high line. Two very quick full backs and I think Gabriel will be an upgrade on Mertesacker.
I think Arsenal even have decent back up in defence now with the likes of Debuchy, Chambers and Mertesacker, which they never had before.
If Wenger keeps with this team, and doesn't do something silly like dropping Coquelin for Arteta, then I really think they can challenge for the title next season.