That's a valid point; some people might not be able to run all their programs on a Mac, at least not natively. Some businesses address this with virtualization, allowing Macs as a BYOD or COPE option, but using virtual machines for specific needs. Others limit Macs to certain teams or divisions. But analysts I've talked to say that enterprise acceptance of Mac is growing, overall, and that Macs are annually gaining around one percent of enterprise market share. I've seen studies that say over half of enterprises support Apple computers-- so they're an option for many, but also a non-option for many.
As for price, yeah, the nicer hybrids are still pricey. There are cheaper hybrids, but few of them are as appealing as the Surface Pro 3.