That's already very common practice, and unfortunately it's not very effective. Bear Stearns was 30% employee owned [1], and Lehman was 25% employee owned [2]. All that stock became worthless when the firms blew up.
[1] http://www.nceo.org/main/column.php/id/282 [2] http://online.wsj.com/article/SB122117966831526067.html