From looking at the new Prostaff 7, which are more than an inch longer than the Monarchs, and have more "barrel" to wrap my fingers around, I would probably like the ergonomics better than the Monarchs, but I wouldn't buy them because of their lesser prism coatings, which takes us back a two decades to aluminum.
Being that the Prostaff 7 has the same specs as the Monarchs and mimics the shape of the upscale EDG II, it puzzles me that Nikon didn't redesign the Monarch with this body style instead of bringing out a new entry level of roof with better ergonomics but lesser optics!
A newly designed EDG and Monarch would have been something to talk about!
My unsolicited (and free) advice:
Drop the Trailblazer. Except for neophyte birders and hunters willing to buy plastic packaged sporting good store bins, I can't see the point of these in a day where Chinese p-coated roofs are so cheap.
I also can't see the point of the Monarch X design, with it's obstructed "open bridge". I would redesign the Monarch X, keeping the sharp optics, good edges, and dielectric coatings, but house the optics in a modified Prostaff 7 body (to accommodate the larger objectives).
The X2 would compete nicely against the Leupold 8.5x45 Northfolk for around the same price.
I would add ED glass to the Premier series. Too much CA for that price point. I'd also add gel pad thumb indents like on the EDG to make them easier to hold.
The Premier ED would compete against the SLC-HD but more competitively because of their lower price.
Leave the SE series as it is except keep upgrading subsequent production runs with more advanced coatings like you have been doing. But please gives us a better strap! Even the Nikon standard strap (NIK-6118 38 mm) is more comfortable, and I use it on my SEs.
Some suggest adding twist-up eyecups to the SE. I think that's a bad idea because if they were fit over the oversized prism housing, wider than the width of the current rubber fold down eyecups, they would be humongous and too uncomfortable for users with deep set eyes.
ED glass would be a nice addition, particularly on the 10x42 and 12x50 models (I sold the 12x50s because the CA was too distracting for watching birds of prey). However, if the ED glass drives up the price more than $200, it probably wouldn't be worth it.