While these are valid concerns, you can't wholly pass the buck to OpenSSL and to people installing a new version of OpenSSL and re-linking ruby against that -- ruby project should should always ship the most secure ruby possible, all the time.
Newer OpenSSL has already changed these defaults, smart people who know what they are doing have already agreed and documented that this is a good idea, and ruby is only hurting their users by dodging responsibility.
edit: spelling.