I'm under the impression that they will be much more advanced than the last-gen game, Morrowind. They will be more like the RDR carriages i think.
It's possible. We know Bethesda have played a lot of RDR and probably gotten some ideas from the game.
In any case, a lot of people are really happy about this. It was definitely a good choice of Bethesda's part to implement this. TES is a complex open-world RPG where exploration is one of the main features. Having a travel system that works for everyone and that feels natural is therefore essential imo. While the magic map can have it's uses (despite I personally hate it's "unimmersive-ness"), it can never fit as good as carriages in a world like TES.
Even if carriages weren't connected to fast travelling, they should still have been in the game, imo. Simply because it's logical for merchants to travel between towns, sell goods, buy goods, etc etc.
You have a rather simplistic view of what it takes to put something into a large scale project. Everything takes time for anolysis and design. Art assets have to be created. Developers need to design the systems so they work. They have to be tested and balanced. Reviewed, tweaked, bug fixed, tested again. Etc. I doubt there is anything that goes into the game that is just "Hey have Ralph over do this thing real quick. No one really cares how it turns out."
We are essentially getting 2 fast travel systems in Skyrim. I think it is pretty obvious something else isn't making the cut because of that. That developer time and resources might have been the difference between things like Spell Crafting, Horse mounts, or a whole host of other things we don't know anything about making it into the game or not.
I'm absolutely sure it will be a great addition to the game for folks who are going to use it and enjoy it. I think it would be a rather tough call for most folks to make though if they knew what they had to lose to get it when the system is already rather redundant.
You can say that about pretty much anything. It's a game. A game has features. A game has stuff in it. What do you expect? Obviously a lot of people are happy about this implementation, so there's really no issue. There's also no adequate causation between these specific carriages and these specific spell crafting, horse mounts. If you go by your argument, then you have to repeat it in every single thread here on the forums speaking of a feature in the game.