The 100mm macro is a special lens and worth keeping no matter what in my opinion, the 135 is special and has probably the highest level of discretion of any lens that returns a spectacular image. The 70-200 IS Mk2 returns probably better image quality but is not discreet at all. Everyone notices this lens and that can be good and bad.
As previous posters have mentioned it gets down to what you use and what you want. I recently sold my 70-200 IS MK1, but hired the MK2 to use at a wedding because nothing competes with this lens over that focal range for quality and usability, maybe just that extra stop of light on the 135 could be handy, but the the MK2 has the best IS in the business, so the extra stop is not really an issue.
But it is of no use if you have the best lens money can buy and you leave it in your camera bag and pull out another because it doesn't stand out in a crowd.
I have hired the 70-200mm MK2 for another 2 weeks and will use it extensively, then review how much I used it and decide whether I can't live without it. As good as it is, at this stage I don't think I'll buy one, but if I was shooting a wedding every weekend, I would have one, for sure.
Good luck with you deliberations, all three are superb lenses, but very different in their own rights. And there is no future in hiding things from the wife.