I don't think I agree with you. Systems have been evolving, some are being deprecated, rewritten, etc. It might be true that the OSS world has been catching up

I don't think I agree with you. Systems have been evolving, some are being deprecated, rewritten, etc. It might be true that the OSS world has been catching up so it is worth less to have a custom made solution. But the fact that systems are aging does not mean that those systems are becoming irrelevant.