All this stuff would be super interesting... as a what-if sequel. This is almost certainly not within the scope of the game, particularly seeing as your Uncle isn't even part of Steele. In the tutorial section, the Gryvain's can drop the Ancient Long Laser Rifle, the description of which states that Maximillian has his own company, which is further indicated through the Mining Robot's in Penny's quest being MaxCorp bots. Jack/Jill, your rival, wants to take over Steele Tech, which has been going on through the space probe chase between you and them. Max may have been implied to be a greedy dickhead, but the antagonist is your cousin, and if anyone would take over Steele before you, it would be them.A Steeletech double cross perhaps? Your uncle goes for takeover and shuts you out for the most part. Build an empire to get it back.
But even aside from all the in-story reasons as to why it wouldn't happen, it should also be noted that this game is pretty much nothing like what you've proposed. The sheer shift in style this would be is akin to the ending of Fable 3, where all of the mechanics and gameplay up until that point were effectively tossed out the window to just ask you "Do you want the red option or the blue option" several times in a row and then the game calls you a dickhead. If it were done in TiTS itself, it would likely be about as short and meaningless as Fable 3's too.