I haven't noticed this myself, but if true it would be a welcome trend indeed. We just became a family of 5 a few months ago and finding hotels for our upcoming vacations has become much more difficult. We've already booked airbnb and other vacation rentals for 2/3 of our 2017 trips, with the remainder being at Residence Inn's or the occasional, affordable "family suite" you mentioned. It makes sense that hotels would try to respond now that family's have more options.