Well finally able to let that sink in. What will get replaced is only the drainage pipe and not the water lines as those are fine. @js0930 The initial guy who came out for our free plumbing inspection said shark bite fittings are bad as we have them in a few places.
Replacements and some bundling items come to $9,000. They replace drainage pipes, new water 50-gal water heater (worth $5K for tankless?), reset some toilets, and fix our washer drainage. Instead of the normal below picture where the drain is as high as the washer, ours does this then has a one way valve where the water has to fight gravity and travel up to 8ft high to reach the drainage pipe and the washer/dryer are in the basement. I guess this puts extra stress on the washer. They will also install a laundry sink and pump to get the water high enough to drain.
Going to get more estimates but this would make our house up-to-date internally. It will also allow for easier bathroom remodels as they just have to replace the facade and not internals. From my current internet searching ability...this price seems reasonable. We will see.