I think it's way too early for that. There are still a lot of people playing RTW and they are still making decent money with it, but releasing the source code means giving the game away for free to all those who may probably still buy it. There is a number of people who got on the TW-train with later games, who go on trying older installments and it will remain that way for a while to come.
I don't understand what you mean by "indirect profits".
Edit: I think I may have misunderstood. You are not talking about a public release, but about giving the code to a limited team of independent programmers, like what for example Paradox has done with, urm, not sure which game it was...?
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