Reason? Scot Pollard. We finally have a last-year (and of decent size) contract to use as a bargaining chip in a trade. When used creatively, a backup C with an expiring contract can net you Carlos Arroyo. So, with that in mind, I think Scot's contract combined with Ron Artest makes Ron more tradable because right now those expiring deals are attractive to just about anybody.
Plus, adding Scot's contract to Ron's makes the sum total equal to that of players that approach Ron's actual playing talent. That's if anyone would feel like giving that up for Ron.
If Ron's going to be traded, between mid summer and the trading deadline's probably the best window of opportunity for the Pacers to do it.