Could it be that the general mindset of the average Japanese fan at this time was losing faith in the idea that pro wrestling was as legitimate as they had initially thought? Thus forcing the competitors to adapt, in this case taking greater influence from outside actors such as the WWF and to a lesser extent JCP whose business was in using pro wrestling as a chassis for over-the-top live action dramatics. When you consider how much effort was put forth by Maeda in '88 to denounce the legitimacy of the other two companies, I imagine that would have dented the perception of the "sport" in a lot of fans' minds, although I've not read anything explicitly stating as such.
Thinking about the start of the original UWF as well as Choshu leaving New Japan, the focus on entertainment over conveying legitimate competition moves gradually from that point onward, becoming particularly obvious in the Takeshi Gundan angle, for example. As a wrestler entering the industry during the change of eras, this paradigm shift must be more than apparent; and for those who eschewed U-style and joined one of the big two dojos would've surely absorbed the influence that late 80s US wrestling had on AJPW/NJPW around that time, excursion or no excursion. Another thing is that wrestlers coming in around this time would've been a young child during the Inoki/Tiger Mask stretch, where the appeal of pro wrestling began to really expand. This would have likely meant more people applying to the dojos for that reason, drowning out the field of codgers who, as you say, looked at pro wrestling as a job first. To parallel this thought, consider the number of AJW dojo applicants at the height of Chigusa's popularity, as she influenced so many schoolgirls to want to become pro wrestlers.
Hopefully I'm making some sense!