We have floorboards in all but 2 rooms and the bathrooms in our house.
My only complaint - and this could be the actual floorboards - we have the 12mm laminated on underlay - could be different with real hardwood - is they echo a lot.
I find them a lot easier to clean - sweep/vacuum and damp mop. Cleaning up food mess is easy - no stains - no need to get them professionally cleaned. I find them a lot cleaner than carpet.
In bedrooms though - it's not a 'cosy' feeling .
As for replacing carpet ... Not sure by the time all the kids are in high school maybe?