That's what they should do! Simply improve HGL's weak spots. No open bridge design is needed to make a successful product IMHO.
I agree that the HGL has "weak spots" (I also think the LX had better optics), but from what I've read so far, the EDG's optics (except the 7x42, which is a new configuration), are the same as the HG L except for an ED element housed in an open-bridged design.
Same rolling ball on the full sized bins. I'm not sure if they toned down the brightness so the contrast doesn't get overwhelmed in bright light like the HG L (with the added ED glass element, that would seem doable) and the ED glass would also control the excessive CA in the HG L's lead-free glass.
As far as the open bridge design, I would welcome that in the mid-sized models since I have large hands and find small roofs hard to hold steady. However, I found the full sized HG L comfortable to hold (the full sized HG albatross was another matter, same ergonomics, but hefty weight - 36 oz.)
In any case, IMO, $1,800 is an absurd amount to pay for an ED element upgrade and a new body style when you can buy a used HG for $1,300 less (check Amart).
However, the HG Ls were $1,400 when they first came out (though I only know one person who actually paid that much for one), and I've seen HG Ls sell for "like new" or refurbs on eBayo recently for btwn $800-$900.
But the "rolling ball" on the full sized models is a deal breaker for me (the mid sized models have some pincushion).
If you can see it (not everybody can), then buy an 8x32 HG, which is only two ounces heavier than the HG L version and has less CA than the HG L and has much smoother panning than the full sized models.
Nikon will repair any Nikon used bin for $20 in the US. Takes the worry about of buying "used".
Or if you have patience, wait until the successor to the EDG comes out, and pick up a used or refurb EDG on eBayo for about $1,200.
Brock