Yukari may retire and the first conversation it brings up is the potential for less yuri undertones...Really?
It's not even "in your face," none of it is (Well, except for Nanoha Innocent). It doesn't take up much time, it's a welcome reprieve from all the beamspam, and their strong friendship makes sense considering what transpired during the 1st season.
The problem is not the blatancy of the yuri, its the fact that the need to have yuri elements, blatant or otherwise, forces other good story elements within the story to be shafted. An example is Fate's relationship with Erio and Caro, her adopted children. We are told they have a good relationship, with Fate even taking the role of a doting parent, yet we hardly see them interact with each other apart from training sessions and the occasional exposition. If we really wanted to confirm their supposedly good familial relationship, we had to go to the supplementary materials, and unless one really likes the story, they won't bother with it.
Compare that to the amount of time we Fate together with Nanoha and Vivio. I'll use myself as an example and simply state that I view those scenes as a friend with a little bit of child raising experience helping her inexperienced friend out. However, I'm obviously not the only person watching this show, and to others, these scenes are "Nanoha and Fate are raising a child together! NanoFate confirmed!" There's only a passing mention that Yuuno also helps Nanoha look after Vivio in the last episode. Vivio hangs around in the IL so much that she's has a librarian's licence by 10 years old, which you only learn in Sound Stage X.
So it's not the existence of yuri within the show that's the problem, it's that the creators favor the yuri elements over more interesting things that could've made the story better.
I'm about 120% certain you guys would eat it up if a male character was involved and it wasn't girlxgirl. Which really makes the argument fall flat, because it's not the "excessive" undertones that bothers you, it's the lack of a penis.
Which would explain the sheer popularity of Force here. We sing praises to it, herald it as the magnum opus of the franchise, and Touma is the best Nanoha protagonist ever, with Erio coming at a, sadly distant second.