“It’s been really interesting to see,” said Simon on a CNBC interview. “The physical retailers are getting that double whammy: They’ve got online sites that have been busy all weekend as well and are now really getting another real shot in the arm on Cyber Monday. So they’ve had three Black Fridays, if you will.”

No less than 88 percent of U.S. adults bought merchandise from physical retailers — either directly in-store or from store websites — on Thanksgiving Day and Black Friday, according to ICSC Research. Cyber Monday was also a boon for physical retailers, because 80 percent of shoppers were set to patronize them, either in person or online, ICSC Research reported.

“What is very interesting about this holiday season is that I think you’re going to see traditional retail taking share from the online-only players,” said Sheffield. "And they are in a position to continue to do this and [to] outperform them over time, because they have their base of their traditional stores, which is a much more cost-effective model."

A recent ICSC report titled The Halo Effect: How Bricks Impact Clicks demonstrated that physical stores are essential to the success of online retailers, in terms of both sales and marketing.

“Those retailers who have figured out how to stabilize their brick-and-mortar business and are winning in brick-and-mortar and then [are] able to build a viable e-commerce business — they are the ones I’d be looking at in the next several years,” Simon said. “I think Amazon’s going to do well on Cyber Monday, and they did pretty well on the weekend. But they don’t have the physical stores to get that massive traffic as well.”