Even as a non-JW, I've noticed a drop in attendance. I drop my JW wife off at meetings and have seen the number of cars in the lot go down over time. I would estimate the number is about 2/3 of what it used to be. The KH now houses four congregations. A nearby KH was closed this year and the single congregation was relocated here. The relocated congregation has their Sunday meeting on Saturday morning. Meeting times for 2020 will rotate next week. My wife's goes to 3:30 pm. Ugh.
To be fair, it's happening in other denominations as well. At my Christmas evening service, there were plenty of seats available. It used to be packed and overflow seating was needed.
Somebody used to always park in the stall furthest from the KH building even though they could have parked much closer. Being a wise guy, I asked my wife if that was disfellowshipped parking.