I have to disagree with you, guys. Aragorn is certainly a useful hero, but he becomes less powerful and efficient at level 7, when he becomes the Heir. I mean, as much as I like his Brego ability, what is its purpose? Even compared to other hero killers, Celeborn at level 7 gains the Squall ability, which protects him by arrows and nearby enemy units, Eowyn gains the Shieldmaiden ability, which decreases the damage taken by heroes and even more the damage taken by enemy units. What about Aragorn? He gains a mount ._.
So, while I'd not wish to see his Brego skill gone, I think it must be atleast more useful than granting Aragorn more speed movement. Furthermore, I think that his role as a leader and only hope for the survival of Men isn't shown at its best
That's why I'd like to see it changed a little. From a technical point of view, his leadership will just give a small armor boost, which, combined with Boromir's one, is still inferior to the damage boost granted by Faramir + Dol Amroth soldiers (+75% damage against +63% armor) and will mainly affect units not bulky enough (such as Dol Amroth soldiers). It's true that Tower Guards will be much more resilient, but right now there are a lot of ways to counter them (Freezing Rain, all the Mordor debuffs, or even heavily armored Uruk-Swordsmen with the sword upgrade from the Steelwork and buffed by Lurtz. Not to mention the Dwarves elite units)
Finally, the Final Stand ability will give yes a powerful boost, but just for 20 seconds (I was inspired by Theoden's Glorious Charge for the effects). Furthermore, Aragorn's hero killing skills are disabled during the effect and will have to reload when it ends (forgot to mention that in the main post, I will fix it). This will make the player to choose: does he need a powerful but temporary boost for his troops, or does he need Aragorn at his full potential?
On the other hand, I agree with you about the Demand of the King ability. I think it's a bit repetitive, since Ghosts are already present on the spellbook