Arsenal mania is getting good again. They seem to be under the illusion that signing Lacazette, (who looks more than decent but not world class, and seems to be a good signing for them, especially as a Europa league side) immediately makes them genuine challengers for the title next season. Their team is miles away from that, there's a handful of potential title winning players in their squad at best. They'd need another 5/6/7 top class players to be at that standard. Cech is ageing badly at Arsenal but can still do a more than adequate job in net, Koscielny is capable and Bellerin is very good from the defence. Then they've got Sanchez (for now) Ozil on his day but his day doesn't come around anywhere near often enough and he's next to useless when it isn't his day and finally, potentially Lacazette but he's obviously untested. Aside from those players and a few capable squad players, particularly their homegrown quota the rest of their squad is mediocre and nowhere near the standard of Chelsea the current champions. Their midfield in particular is dire.
Even if they keep Sanchez the absolute best they can hope for is 4th imo and i don't see how they'll get it. Chelsea will remain a force, Spurs don't look like losing anybody key to them other than Walker who wasn't even getting in their side at the end of the season so i expect them to solidify and challenge again, United under Bourinho, will improve their efficiency and us after a season under Pep should be able to iron out any problems and with the players we have already brought in and the ones we look like signing we'll be expected to put in a strong challenge. Liverpool with the added champs league football and the rather small squad they have will probably drop but United will take their place not Arsenal, i don't see anything other than those 4 teams in a fight for the top 4 places with Liverpool, Arsenal and Everton in a clearly defined tier below those 4 fighting for Europa league and the chance to pounce if for whatever reason one of the other 4 have a disaster.
Also, their new found assumption that the very second Sanchez turns 30 he'll turn to absolute shite is great to read too. I guarantee Sanchez would have a more productive year with us when he's 30 than he will next season at Arsenal if he's made to stay.The guy will lose some of his explosiveness as he creeps into his 30's but probably not until he's reach 32/33 and even then genuine world class players like him adapt. Look at Tevez when he went to Juve, it was claimed he'd lost his edge because of his age and was brilliant for them.