I am a Catholic myself, but the stark truth is almost 90% of converts are not seekers, but doing so because they are getting married to a Catholic. Per Capita, there were more conversions in the 50s.
Perhaps in the old days, that was the case, but marrying a Catholic does NOT require that one convert to Catholicism. One is perfectly free to remain a Protestant. There will always be some people in our RCIA class joining for the sake that you mention. Some "grow" into the faith quite comfortably, others, you can tell it is to please the spouse. From my five years of experience, I would say that maybe 60% of RCIA are coming because the spouse is Catholic. And of these, most don't feel pressured to become Catholic. They are moved by the witness of their spouse, just as any other seeker is. We have had a lot of widows/widowers and even some unmarrieds lately. I think a lot depends on the age of the person, if that makes sense. Most of the 25-40 year olds are there for the reason you stated.
Regards