Give him time - I wouldn't worry about it - if he likes it, he likes it - if not - then you just got a cute addition to your room and one day he just may find out it's pretty cool in there.
my girls have one of those fabric houses - do they sleep in it ? noooooope !!
Do they WRESTLE in it ? oh yes
the house bounces all over the den and they have a ball
This is a picture of the day I set it up - ( I love it)
it looks like Chanel is laying flat on her back laughing her butt off -
this is what the house STILL looks like when they're in it...then I added a butt shot pic
both trying to fit thru the door at the same time