I'm sorry, your assumptions have me somewhat perplexed. Because we didn't re-up Forte, traded Bennet, and Cut Slauson... the Bears will have a crap offense this year?
Matt Forte (Not known as the best short yardage back)
262 touches 1287 yards 7 TDs (4 Rushing, 3 Receiving)
Jeremy Langford
170 touches 816 yards 7 TDs (6 rushing, 1 Receiving)
* Matt Forte better YPC and Jeremy Langford better Yards per Reception
I would net this as a loss at the RB position, but not a big loss. We can only compare this season's trio to last season trio, when this season ends. New RB that could be a really good starter or rotational Back makes this only a small ? because Langford's stats are fairly close to Forte's
Martellus Bennett
53 catches 439 yards 3 TDs
*This is NOT production that is irreplaceable. I expect even "glass leg"(or whatever you haters call him) to be able to match, but will most likely exceed that production
TE weapon production will be replaced by WR weapon production... EASILY. We only need a decent TE to keep things equal - better
Matt Slouson
Good Guard I didn't like the release, but there was something that the Bears obviously didn't like about his play (whether it was injury or that he didn't fit the scheme) the Bears wouldn't have released him without thinking they had someone comparable or better (he wasn't making THAT much money)...
*Fan Unknown
There is nothing in these three losses that make me think. "OMG WE ARE SCREWED THIS YEAR!!!"
You either need better statistics to back up your assumptions, or you just need to be funnier with your trolling.
The Bears lost 6 games by 7 points or less last year; with a -4 turnover ratio. If the defense can bring us in the positive turnover ratio and the offense even remains as good, then the Bears are a much better team.
The sky is not falling, but if it makes you feel better to think so... at least keep the rest of us out of your fantasies.