I'm least sympathetic of major market "hawks" such as Grousbeck and Johnny-Come-Lately Ted Leonsis who are going to continue making money regardless. Even the notorious Donald Sterling wants a season.
But it's complicated. The Celtics are due for a fantastic, new media deal, which will be one of the best in the league. Once that's official, revenues will be strong, and then the focus may shift to the reality that this roster has a short window. With short-term TV money and a strong roster, worries are more about years from now - the owners' long offers are tailor-made to that.
The Celtics would be payers in any revenue sharing, especially when their new local TV deal is complete.
The Celtics are set to have a great media deal in place, that's true. As a franchise, there's little risk of them not at least breaking even.
I think the concern might be on the competitive side, however. The Celtics are not in a great location to lure free agents, and with the Big 3 getting ready to retire, ownership has to be concerned about another prolonged competitive drought like the team went through after the original Big 3 hung up their sneakers.
Perhaps Wyc is concerned about paying a lot of money for a team that isn't consistently making the playoffs or contending for a title -- in other words, a team that may not lose money, but doesn't bring in a lot of profit, either. If that's the case, his priority would be to limit player salaries and / or put in place stronger measures to maintain competitive balance (e.g. re-work the draft, give teams greater ability to hold onto free agents, etc).