You use a lot of exclamation marks in your writing.
!!!
Tesla Powerwall 2 | EnergySage
Looks like the warrantied cycles is 3200. Assuming that's one full charge and discharge per day, that'd be just over 8 years 9 months. But not even knowing your location I'd guess there will be many days they have very small partial cycles, and very few days of full cycles. A spitballing guess would be closer to 20 years. And that's just to get to reduced capacity - not even a replacement point.
I have about 14kWh of lithium batteries on my boat along with 2kW of solar and when we're away from the dock that's exactly how they work. I anticipate they'll last at least 20 years. On typical days the batteries don't get below probably 60% and fill up at least once per week.