They're will always be people who will be mad, some even if the team wins the World Series. Sure some people will be pissed. I might not be too happy if they come up short and a potential upgrade might have made the difference. Then again I don't nor anyone for that matter know if a trade was made would it have helped. Hell, we don't know if AA could make a deal that didn't lead to years of rebuilding again just to make a shot now. We'll never know if something could have been done or not since we're not the GM and/or the GMs talking trades.
You'll have the bandwagon fans who will bitch like they always do and stop showing up and you might have some people who get upset that we came so close yet didn't make it in wondering if something could have been done. The only way I would be royally pissed is if AA had a decent trade lined up and didn't go through with it either because he dropped the ball or if Rogers said you don't get another dime even though this will push ups into the playoffs and possibly the World Series. Again, we'd likely never know that.
Some will be mad, some upset if the team is this close and something falls apart a la 2000 when the Jays went on that losing streak and doomed their WC chances. I'm used to not making the playoffs so I can't be too upset if that happens. I might be disappointed as many might if we come so close yet so far but we as fans can't really do anything about it. BoSox fell apart, other teams that were favourites failed to win, make the playoffs, win the series so if people get pissed then so be it. s*** happens. A lot of things can't be controlled.