Connection and passion for an industry is not a prerequisite for success. Passion comes and goes, both in intimate relationships and professional ones. Passion in your life is something you nurture and develop over time, and with the right set of mental habits and the appropriate circumstances, you can fall in love with something after you've chosen it. I tend to suspect anyone who discounts business people from the tech industry of not fully understanding what business people do and the value that they provide, and so defaulting to gut instinct based on projections of their own feelings.
As for hoping that tech can survive this dilution effect, what is tech? Do you mean the technology community, which for the most part is very segregated between engineering and sales and operations? An influx of business-minded people isn't likely to affect the engineering side of the community. If you mean technology companies, they will continue to hire the talent they need, and if anything a greater supply of talented individuals is a good thing.