Wall sustained five fractures in his left hand and wrist in the second round of the playoffs.
Motta served as the coach who led Washington to its last NBA title in 1978.
Beal appeared on ESPN2's First Take on Friday.
The second-year forward emerged to play a significant role in Washington's playoff run.
Wizards echo the sentiment, saying if John Wall had been healthy and active, their season wouldn't be over at this point.
Pierce has a player option for nearly $6 million next season.
Paul Pierce's nullified three-pointer in Friday's Game 6 sent the Wizards to their seventh straight defeat in a home playoff elimination game.
The Wizards will try to stave off elimination and force a decisive Game 7 on Monday.
Wall underwent tests Thursday and was cleared to play again.
Coach Randy Wittman said he is "anticipating" that Wall will play Friday.