I don't think NBA players playing in Europe will make any difference to the on-going negotiations.
There isn't enough money over there for a large enough number of top NBA players to ply their trade there. Nevermind the rest of the players in the league. There will still going to be a huge number of players unemployed or operating on (relatively) low paying basketball jobs.
I don't see it making any difference whatsoever to the CBA negotiations.
Here is the chicken v. egg debate
Is the lack of money in Europe because it is basketball or because it is minor league basketball?
I mean if all of a sudden Lebron, Wade, Kobe, Dirk, Pau, Paul, Williams, Melo, Garnett, Pierce, Howard, Durant, etc. were playing in Europe would the interest in the sport increase to the point where the money could be comparable.
I really don't know the answer to that question, but it would be interesting to find out.