Is the entire NHL for sale?

According to today's Toronto Star the NHL may be for sale:

A powerful Wall Street buyout firm and an upstart sports advisory company have made a dramatic joint proposal to buy all of the NHL's 30 teams for as much as $3.5 billion (U.S.).

Bain Capital Partners LLC and Game Plan International, both based in Boston, tabled the offer in a 30-minute presentation to NHL owners on Tuesday in New York, three sources told the Toronto Star.

The companies were invited to make their pitch by NHL commissioner Gary Bettman.