Oh man I love my GTI. I've had my 2015 MK7 since...well 2015! It will be 9 years in May. The longest I've owned a single car by more than double.
And I plan to hang on to it for another couple of years. Before it, I had a MK6! And guess what? There is a good chance I'll pick up an 8.5 when they are released!
But like you, I have kids to think about and as they get older I wouldn't mind having something with a bit more space.
So I do have sedans on the mind. Or if the stars align, a fun wagon of sorts.
Right now the primary kid-hauler is the Bronco. It does the job pretty well. And then there is the ongoing project. a '73 T3 Squareback.
I had an E30 for less than a month as a project almost 20 years ago. Picked it up from a guy for a few hundred bucks and then was offered more than that by someone else so I just went ahead and sold it since I already had another project at the time - a MK2 Jetta with a VR6 swap.
If you haven't noticed, I'm a bit of a VW fan. Before the Bronco we had an Atlas, and before that a Tiguan, and another Tiguan, and a Bug...