Considering the price of most modelers and the reliance modern society has on computers, I'm not surprised that they've taken off.
I, personally, have only used them when trying to get basic ideas recorded or when I was living in an apartment and worked odd hours and had to use drum tracks to practice my band's songs.
Nothing can deny the power, feeling, and tone of a proper tube amp, though- therefore, they are all I would use when I give a damn about how my playing is coming through.