I really only see Dems potentially controlling the House for two years after the 2016 elections. If Dems keep the Senate majority this year, I see them holding on to it for a while, possibly her entire presidency.
I can't see how this reasoning is anything other than wishful thinking.
It's very plausible:
Senate: Dems have 50 or 51 post 2014. Dems make enough gains (WI, PA, IL, NC, etc.) in 2016 to pad 2018 losses (IN, MO, ND, FL, etc). 2020 shows no large change for either party. And finally in 2022 we're back at a tossup majority like this year and you flip a coin, therefore having the potential of holding it her entire presidency (provided in this thread's scenario it's two terms).
House: Republican hold in 2014. Dems barely scrape together a couple seat majority in 2016 before immediately losing it in 2018. Don't have another chance at House until presidential year post redistricting (2024).