There's something fairly close to a law which says that disruption is a good thing. Industries can only be disrupted by entrants that provide products that consumers prefer, so we have almost-a-law: disruption is a preferable-to-consumers thing. There a few cases where that's not socially desirable (I suppose crack replacing cocaine would be an example) but those are exceptional enough that I think we ought to regard disruption as presumed good unless shown otherwise.
Similarly, a decent heuristic for choosing whose interests to consider out of an established industry and a competitor is to let consumers choose which one is better. Of course this can be difficult for those in the established industry, but we're in a society-wide Prisoner's Dilemma over this, and a useful function of government would be making sure we all cooperate. Letting consumers choose the best companies is cooperation; protecting your own industry is defection. I'd be better off if my job and income were guaranteed, but I'd be worse off if everyone else got the same deal.