People are overreacting.
I can't of think anyone who has been on such a sustained run of bad form that they actually should be dropped. Indeed we don't need wholesale changes to the squad at all. To say this season is similar to last season is way wide of the mark. Last season we struggled to bowl sides out and barely won a game. When we batted we batted so slowly that even when we batted 100 overs we might have only made 240. This season we've bowled sides out, put up bigger totals and actually won some games. Won away at Hampshire, we don't do that often. Beat a strong Essex side at home. Beat Kent on a flat pitch with the useless Kookaburra ball, a huge win, wouldn't have won that last season. We were capable of none of this last season.
In terms of the squad after losing Sibley and letting Lamb leave we are probably a back up batter light but prior to this game. Bethell has done quite well particularly when you factor in what he's been exposed to i.e Essex away on a raging turner and S. Harmer. Players like Bethell need to be given opportunity, they won't always do well, he's had 1 bad game in a game where many batters didn't get a score. Barnard is getting criticism but remember he wasn't exactly a heavy wicket taker at Worcestershire though yes he has had a poor 3 games with the bat and he could do with a score. He balances the side, a 4th seamer who can run through some tight overs and maybe nick us a wicket, he has done this for us. He's never gonna run through sides, he's never done that.
One area that does need addressing at the moment is game management. That's 2 weeks running now where we've had a significant collapse right at the start of the day. Today's was totally avoidable, Hain getting out like he did to de Caires exposed the lower middle order to the new ball against fresh bowlers. Mousley getting out yesterday afternoon was huge in the context of this game, Middlesex were starting to look a little bit demoralised and were dying to get off for the forecasted rain. So for Mousley to get out the way he did, after playing so well, with the field set the way it was (no slips in, Middlesex were in total defensive mode), was incredibly frustrating/naive. Had we have started today with Hain and Mousley, 2 well set batters at the crease against the new ball, today could have gone a different way. Maybe.
Game management.