Hell yeah man old consoles always have the best memories! They might be worth a lot in a few years.

i would keep them they have great sentimental value and you can pass them on to your children someday. Also you can always play them every now and then and remember all the good memories you had on them back in the day i still have my original xbox console and i keep it in my closet and whip it out every so often to play and cherish the good old moments i had on it

Yeah you might a well keep them, if you have a few things that you're thinking of getting rid of just get a small storage locker.
As for your kids playing them they probably will, but as for anything that is old you get tired of it quickly.

I am going to keep my both because the amount of time that I have spent playing them, and the countless hours of sweat I have put into the paint on the controller by now, but also because they most likely will become antiques as more and more are thrown away or discarded.