maybe install them all XD then again maybe the world cant hande a threeway merger, like if someone did it'd break their rig

That's probably because Skyblivion is such a long way from being completed. Skywind will take a long time to be playable as well.

I think it's safe to say that there isn't such a mod because if there was, why would people spend so much time on making Skywind?
There are, however, other modding projects that aim to create a different version of Cyrodiil in Morrowind and Skyrim from the one seen in Oblivion.

There is no mod that glues them together. And, to be honest, I don't see why there would be something like this. I didn't play Oblivion, but I played the others. They feel very different. While I enjoy Skyrim combat, action, environment, I like Morrowind's dialogues, quest log, character creation and the overall world more.

And, to be frank, both of them have tons of content. You can play any of them for hundreds of hours and still having different things to do, so I don't see any point in making mods that would mash them together. Skywind would be Skyrim with an extended quest line and nothing else. It wouldn't be Morrowind because it is a completely different game. Skyrim does already have more than enough content, so I don't see the point. If I want to play Morrowind, I load that one up. With few mods it's perfectly playable on modern PC and it's great.

I don't think the main purpose of such mods is to improve the target game, but to run the source game in a "better" engine, with better graphics, etc. Easier integration with/transition to the next game is more of an afterthought. I think the best way to get those results is to invest in something like OpenMW. In that case, instead of complaining that the engine can't be made to act like the older/newer engine, you can make the OpenMW engine act however you like, and even switch between behaviors without some sort of hacky mod. One could even technically port Daggerfall and Arena to that engine, given enough time and effort, and allowing for different "model" types, including posterboards of yore. Trying to get it all work in a different Bethesda engine seems like a waste of time, at least partially for the reason you gave: Of course, I wouldn't be saying this if OpenMW wasn't in as good a state as it is; making it that far is a huge amount of effort, so e.g. porting NWN1 to the NWN2 engine makes more sense.

Combining all three games together wouldn't make much sense internally. You could perhaps combine Morrowind and Oblivion together; but while only six years canonically separate TES3 and TES4, TES5: Skyrim is set in a different era, long afterward. You get to revisit Solstheim in a Skyrim DLC and you see that Vvardenfell has been completely wrecked by Red Mountain erupting.

The alternative to combining the game is having mods that extend the game world. For Morrowind, there's Tamriel Rebuilt which completes the Morrowind province and Project Tamriel which is about the rest of the continent (only the Skyrim province is making real progress at the moment, though).