@broomfielder You need to step back and look at the big picture. The transmission woes do not affect 100% of the 2019 MY Odysseys. If your Odyssey is driving fine and your family is comfortable with the ride and amenities, it seems silly to cash out your 2019 and buy a new Sienna. You already have taken a large depreciation for your Odyssey. Your Sienna will likewise depreciate in value (especially the first 3 or so years of ownership). The maximum amount of money that you'd have to pay for maintenance or even the dreaded transmission overhaul/replacement will be far less than the depreciation that you'd suffer in the first few months of new vehicle ownership.
Toyota apparently offers 2 years of "free maintenance and service". This is done to restore faithfulness in the Toyota brand after the random uncontrollable acceleration that affected some Priuses and Camrys around the late 2000s. They did not offer any credit incentives to Prius and Camry owners to make up for the accelerated depreciation of the vehicles that went through the safety recall. That is one of the many reasons I will never buy another Toyota. Also the costs of the incredibly generous "free maintenance and service" has been rolled into the invoice price of all of the Toyotas, so "free" really means "Included in the purchase price." After 2 years/25,000 miles you are on your own. Oh, during that time period maintenance is basically oil changes and multipoint inspection, and a few tire rotations.
We bought the first year 2nd generation Odyssey (1999) and had absolutely no transmission problems--we sold it when it had over 230K miles. Our nextdoor neighbor had a 2000, and had to get the transmission replaced twice (Honda paid for the first one). Our 2006 EX-L (not muzzled) made it to around 235K without any VCM related problems--it just didn't like getting sandwiched between a cargo van and a pickup truck.
Our current 2015 EXL was purchased with 45K and is muzzled and the odometer just rolled past 100K.
I think your 2019 still has a lot of life left on it. Yes it doesn't have the bells and whistles that the new Odysseys or Siennas do. The depreciation slope of your 2019 is much flatter than the almost vertical slope of a new vehicle.
If it were up to me I'd rather spend less cash on service/maintenance items than lose more money on depreciation. I admit that I tend to be on the thrifty side, you may not. Yes time is money, but money is actually real money.