This kind of opinion surprises me really along with all the other 'Freddie should give up Tests'. Why? Because he misses 4 out of 6? That still means he plays in the other 2.
So he misses a lot of Tests, but what is the downside of having him play as many matches as he's fit to play? I can't see any. How many times has he broken down in a match and left the team hanging? Even if he were to be injured in the match, he's the allrounder - the most useful but LEAST VITAL player in the team. If he goes down there are 6 other better batsmen and 4 other specialist bowlers to cover for it. I've argued the same with Aussie fans who say we should give up on Shane Watson. WHY?? When he is fit, he is good.