But my argument is: if not only Dijkstra but a huge part of the comp sci community would have decided to patent their inventions it will be impossible to move forward in the field. Only the legal costs of "swimming" on this system will be prohibitive for the developers community.
I don't see it that way. The comp sci field moved forward because of the democratization of the personal computer where you have the freedom to develop what you want and distribute it yourself.
For example one of the mini revolutions was Turbo Pascal from Borland offering the compiler for few bucks when compilers were more expensive, with patents all prices go high and that means few people or companies can spend money on that.