I'll tell my story for your consideration - we own PVB as well. I have a 10-year old now, and before COVID, we always aimed to have 2 vacations a year - one with my parents and one with our small family only. Our 2019 trip to PVB was different because it was supposed to be for our small family only, but we had an extra years worth of points from the contract that we were able to get 2 connecting LV rooms for a week-long trip, so we invited my parents along as well. They always wanted to stay at the Polynesian, though. I remember as a kid, we always stayed off site and every time the monorail stops at the Polynesian, we would always "wow" at the entrance. But at the core, they're not big Disney fans at their age - my mom hated the walking, and my dad was a lot slower. This was not a trip that they came up with, but came along to travel with their grandson. I got them 1
ECV to share.
We scheduled some time for them to stay at the resort and did things together as a family. We did Hollywood Studios alone one night for the Driod Depot and Smugglers Run, and we did Animal Kingdom without them. But we went to Epcot and MK with them. We ate separately some nights, but was able to eat together for character breakfasts and was able to take them to the Spirit of Aloha Luau. They explored the Polynesian Resort on their own and even went to Epcot briefly while we were at the Magic Kingdom. My parents did not hold us back.
The low point was my dad getting "lost" in Epcot. We couldn't find him for 30 minutes as we were watching a Sugar Ray concert from afar. I logged into my phone and the tracker I planted in his bag was...well...right next to me alongside his cell phone. My wife and I split up and searched for him from China all the way to France. He had a bit of dementia at the time and, needless to say, all the bad things that could happen to him were in my head. But we returned to him sitting at our table and found out that he went to the men's room and decided to go into the building and got whisked into The American Adventure show and couldn't get out. It definitely wasn't an easy trip as I felt like I had to take care of my parents and my own family at the same time - it was stressful.
That said, I don't regret it. COVID came, and we haven't travelled together since then. My mom had a knee replacement, and my dad is now in a nursing home. Things declined fast. We look back on our pictures and we're glad that we were able to do "one last trip together" no matter how stressful it was. I'm glad to have the photos and the memories. My son still asks if grandpa will ever be able to come on a trip with us again.
I say this because talk to your wife and see how she feels and leave the final decision up to her. I think I would have regretted not asking them, especially when the extra room was "free" due to the extra points. You don't want to be the reason for that regret.
I know my situation may be different, but it's just my 2 cents for your consideration. No one can tell what the future holds and, with family, "now" is always the right time.