From what I see, users can choose multiple consoles, so the inclusion of PS2 doesn't change answers for what proportion of the population which said that they still play the PCE.
If I actually crunch numbers...let's see.
- From wikipedia, there's about 50,000,000 Japanese males ages 14+
- Of the sample pool of 1040, and 4.7% (~49 people) said that they play the PCE.
95% Confidence interval for this figure is 1.29. That is, one can be 95% confident that the true portion of the Japanese male population that still play the PCE lies between 4.7% +/- 1.29% (between 3.41%~5.99%).
Once again, in order for those numbers to hold up, the only caveat is that the 1040 people that took the survey was *completely* random.