This niche of the healthcare REIT sector got crushed by the pandemic, but now it's set to fly high as demographic trends start to play out.There are times when unexpected global events have an outsized impact on a company's business. That was true across a broad spectrum of stocks after the coronavirus pandemic began. But at the center of that storm were senior-housing property owners like Welltower (WELL 0.39%) and Ventas (VTR 1.10%).Now that much of the storm has passed, I think these two real estate inve ...