Personally, I'd drop Lyth like a stone. I understand that wholesale changes are not a good thing, so I'd much rather retain an out of sorts Ian Bell than Lyth, who simply doesn't look test class in any way. Bell, on the other hand, is a decent enough batsman suffering a bit of a wobble.Happy to keep Lyth in as he's had so few games would seem just a knee jerk reaction to get rid of him.
But the problem is, who to replace Lyth with. Neither Compton or Carberry represent any noticeable upgrade, and have both been given a chance.