If the only dragons in Skyrim would be the named ones that are buried and resurrected by Alduin it wouldn't have been so bad.
Plus the named dragons should've been much more powerful, using multiple shouts with zero cooldown etc.
That's exactly how I wished they had done it. There should have been no more than 10-20 dragons in the entire game, all of them named and somewhat unique. Almost all of them in dragon lairs and reachable and killable from the start of the game (in theory), and a few only appearing during certain quests (like Big Al himself). None of that Cliff Racer 2.0 shit.
Some of them should be targets for quests to point the player in the right way and give him a push in his dragonslayer career, like say the College of Winterhold feels uneasy having a genocidal dragon resting on the nearby mountaintop and sends you to kill it, and also give you some aid in this particular fight.
Killing them would weaken Alduin's forces in the final battle, where he attacks the capital or whatever. And once he is defeated, whoever is strongest between the Imperial Legion, the Stormcloaks or the Thalmor (depending on Murderhobo Dragonborn's actions), takes control of Skyrim (in the Thalmor's case, Skyrim remains under Imperial control, but under much heavier Thalmor influence and, say, every decision the High King makes must be approved by the Thalmor First Emissary).
Because you can't have an end of the world invasion going on at the same time as a full civil war. Neither side would risk annihillation just to wear the Jagged Crown for a few days before it melts in dragon fire. Instead, the Civil War quests should be covert operations, secret alliances and small skirmishes (some of which is already present in Skyrim, in addition to the respawning cannon fodder whack-a-mole battles) to try to take control over all of Skyrim with as little bloodshed as possible. It would also be more doable since we all know a full scale war in Gamebryo will just end up a disappointment anyway.
Fallout New Vegas obviously does a much better job: The Legion (the dragons) are threatening to attack New Vegas, and the NCR (the Empire) wants to remove its enemy Mr. House (Ulfric Stormcloak) so that it can focus fully on the upcoming Legion invasion - and vice versa. You can't choose to stop the Legion first and then remove/absorb enemies to your faction in Nevada because that would be silly, and the Legion doesn't magically appear in Nipton when you enter the Strip for the first time.