HCJB gave a lot of attention to North America, with both morning and evening/late night blocks of mostly American evangelical programming, mixed with some in-house presentations. One wonders what size audience they had even in their heyday, other than shortwave hobbyists. Credit where credit is due: HCJB gave me exposure to the early "Jesus rock" (Larry Norman et al) and I can imagine they took some brickbats for that. On the other hand, once with a schedule or QSL mailing, they sent a David Wilkerson-penned "rock and roll is of Satan" tract.
Even "biggies" like The Voice of the Andes, HCJB, reduced operations and finally just closed shop when the transmitter site was needed to build a new airport. They first looked at moving, and then decided that resources were best placed in helping to build community stations all over the world. The SW operation began in 1933. Many other international SW religious broadcasters are gone or have scaled back or moved to local operations on AM and FM.
Technology did not start the decline of SW. The decline started when there were better options with better, cleaner signals locally around much of the world. It's not that religious broadcasting has increased... it is just that on SW it has decreased at a slower rate than government international broadcasts... but it is declining too. Big religious broadcaster TWR does not even list frequencies on its website... it send people to local stations or to podcasts!
Bet you can not name any true religious organization that has expanded SW broadcasting in the last 40 years. I can name many that have reduced or eliminated such efforts.