One alternative scenerio here would be if Poser-Daz and/or independent Poser character makers were to offer Sims 2 owners UPGRADABLE higher-rez characters that would make their Sim People more realistic, and early-on becoming part of an inevitable march towards and even MORE REALISTIC Sim 3 version witin another year or so.

Another advantage of Upgradable SIM characters could also be
a potential SALE of a Poser software level character- that is,some Simmers who would also like their Sim Characters so muchthat they would want to move onto a higher level of REALISM- an intro also for Poser Artist or DAZ Studio.

It would sure seem like a SMART MOVE to begin this kind of
subtle inter-linking between SIM and Poser level characters
now, rather than wait until some even SMARTER model-making
company runs off with this idea and forms an OFFICIAL relationship with the makers of the SIMS software...