Another one from the Verizon side. As usual, my opinions don't equal the company's or whatever, but I can give some insight.
There's no active "dislike" or hatred or anything of the sort of Windows Phones within the company. Heck, there's a few WP fangirls at my call center, myself obviously included.
The software and network is what it is. CDMA is what got Verizon to the network reliability that they enjoy today, and it is what made AT&T lag behind us in signal and usability for so many years. They pride themselves on that reliability and they do not want the possibility of a rogue software update causing mass problems.
Now, before people jump on me with examples on what has or has not happened on other phones, I will not say that it has never happened. Nor will I say that I always agree on the heavy software testing standards. However they are consistent in how they treat the manufacturers on the subject if nothing else. I have observed this occurring in every phone from the Samsung Galaxy line to the Blackberry Storm. The androids are treated with very strict standards. Sometimes they make you wait 2 or 3 software versions. I think, if anything, Verizon would rather not have a "Lollipop" situation on a daily basis where the reps spend all day trying to convince the customers that it's time to hard reset their phones because their apps didn't like that update. Apple? Well, if nothing else, they are extremely good about planning ahead. The reason their updates appear so "quick" is they get them certified months in advance.
And the windows 10 update? If my installing it on my Icon is any indicator, it's a lollipop waiting to happen.
So what should we expect in the future?
First off, I'd like to mention that if the phone has the right tech built in, there's nothing preventing a user from activating it. Our billing system may not recognize the phone, but if it supports the technologies on the sim, go nuts. You will have to insert your sim into a device VZW recognizes to perform plan changes on your own however. With that said, there was nothing stopping Microsoft from pulling a Google and making a device which supported the network without getting Verizon's strict approval. Nothing. (Which means the new devices likely won't support Sprint either.)
Second, just because Microsoft isn't continuing with Verizon devices does not stop companies like HTC or LG (that's a new one) from jumping in with their own windows phones, and rumors I've heard are suggesting exactly that. And quite frankly, I like HTC. I wouldn't mind my Icon being replaced by a windows version of the M9 or something. This is the position that Paul Thurrott should have taken...that Microsoft's phones are not the only windows phones on the block, and that there may be opportunities opening in the future. A company should NEVER be the one spreading FUD. Shame on him.
And third, Verizon is currently working on transitioning to an entirely VoLTE voice and data network, but such things take time. Lots of time. Once VoLTE is the norm rather than a nerd toy, you'll start seeing more "universal" devices that work on Verizon. For what it's worth, both of the recent VZW windows phones, despite being modest in size, support VoLTE.
Also, if T-Mobile has anything to say on the matter, it wasn't Verizon doing the snubbing:
Microsoft Doesn't Really Want to Sell Windows Phones in the U.S. | Sascha Segan | PCMag.com
Sources weigh in on limited US carrier interest in Microsoft?s new Lumia 950 phones | Pocketnow
New Lumias continue Windows Phone?s frustrating carrier situation | Ars Technica
It's sounding like the real situation is that there is a vague exclusivity deal going on. As the last article explains, google could do it, so there's no reason Microsoft couldn't too. There have been many, MANY cooked ROMs on the Android side that have made it work as well. (Sometimes with bugs or issues, but once again, that's what the strict software testing standards are about.) Contrary to the belief I've seen around here, there's no VZW-exclusive magic fairy dust that makes CDMA work, and other countries with CDMA networks (such as Asian countries) have used SIM cards on them for years. If apple can do it, if google can do it, if kiddie programmers in their mom's basement can do it, so can Microsoft.