I'm not sure too many people have suggested dropping Klemmer. Tamou is playing very well this year in a pack that isn't helping him much, and would be valuable off the bench, but very hard to get picked in a side performing this badly. His work tends not to get noticed.
I think Tamou is playing well, not as well as Klemmer though contrary to what big league stats might indicate.
I feel abit for Tamou, he's been badly let down by the rest of his pack, RCG is a shadow of his former self, Kikau is injured every second week, JFH is a tackle missing machine, Katoa has about as much vision at dummy half as Michael Lichaa and I'm not entirely sure what Martin, Ellis and Fuimoano offer exactly.
I think the thing that works against Tamou most is his age and his losing record at origin level. I think Tamou is in the same boat as guys like Pearce, Woods, Dugan, Jackson, Merrin (before he went to ESL), Tupou, Dylan Walker, etc who seem to be tainted with the failures of the past