If society doesn't value what IBM produces then they'll go out of business. There are many factors to optimal organization size, and there are different ways of handling acquisitions that can preserve the acquired organization to varying extents. I work for an org that got acquired by IBM and my job (and org) has been remarkably unaffected. Just different folks enjoying the profits.
Like all things, there is much more nuance than "big corporation bad."
Like all things, there is much more nuance than "big corporation bad."