Are you sure his 498A case will have no impact at all—since it's a criminal case? I think that as long as the case isn't dismissed or Asish exonerated, he can't apply for a passport [since it involves police verification].
Impact on Job Opportunities
Regarding job opportunities, to the extent I am aware, PSUs usually withhold any promotions until the case is decided either way [if convicted, the person could lose his job]. In private companies [to which MNCs belong], the response could vary from company to company—I have seen both types of reactions—like you suggested. Based on what I noticed, it seems to depend a lot on the employee's performance value as perceived within the company.
Practical Considerations for Asish
Asish—there's also another practical aspect you need to keep in mind. Until the case is dismissed, you do have to spend time attending the court regularly—which will take a lot of leaves—quite possibly, unpaid too—which may not be agreeable to most employers—not an issue of right or wrong, but of the time spent in non-work-related activities, which many companies may not prefer.
Advice on Job Change
Overall, my suggestion would be this: until your case is dismissed, I suggest DON'T CHANGE your job—since you would be unnecessarily increasing the pressure on yourself. That would depend on your lawyer—on how he pushes the hearing dates.
Looking at the situation from another angle only seems to reiterate the opinion that 498A seems to be more misused than used in the recent past.
All the best.
Regards, TS
Sec 498A, family matter and private issues, it has no effective impact on the public. You need to analyze the matter first, and how it is dealt with in the courts of law. You will get the answer for the kind of reply I have given in there. Also, please note that there is a difference between the proceedings and the established case. The government cannot confiscate his right to get his passport in this matter. You may call it more of a judicial proceeding rather than police investigation.
Also, consider the fact that special provisions apply when it comes to leave to attend the court proceedings.