http://en.wikipedia.org/wiki/Revolution
Regardless I don't see how your quote is "out of context"; I don't see anything in your original post that would indicate the sale benefits anyone other than the owners/executives of the company.
Your reply reflects precisely the attitude that the author of the article is calling out; that many founders set out to create a company for the sole purpose of selling out. The reason this is harmful is that in most cases the sale is to a company who is uninterested in the new, innovative ideas that the original founders incorporated in the product (the same qualities which drew in early adopters and other customers).
This has a negative effect on the overall progress of the industry involved as it prevents "big changes" (I'll try to avoid loaded terms) from happening and allows stagnation to continue.