Convert Japan? Otaku culture is already looked down upon by the highly filial and conservative aspects of mainstream Japanese culture, it's this intense pressure and fact that pretty much gave birth to the sub-culture itself...hence the trope for wachy stuff from Japan, so I don't really see what other pressures other countries will bring to bear. Mind you that otaku culture HAS already done such expansions overseas and such reaction had already occurred in the 90's. Remember how Pokemon was supposed to be the devil's spawn?
Still that's beside the point, all I was trying to point out was that yes OPM is a fun parody with widespread appeal but it's not going to singlehandedly save anime itself that has been in fiscal crises since the 2000's. It's just a matter of fact that sex sells, and it's what sells the merch and tie-ins.
Still I do lament that fact but we have to face how that's what people are buying