I don't think we necessarily have to worry about the lack of experts on either side of the question (although it is tangentially related), as it was a lack of scope.
If we look at the accepted answer, this is what we ended up with as the "advantages" of RPGs over CRPGs:
- More social interaction.
- Good excuse to get together with friends.
- Tabletop RPGs are generally more "open-ended" than MMOs; meaning there's more freedom of action for your character, and you're (hopefully) not stuck fighting the very same encounters over and over again.
- More reliance on your own imagination, which leads to a more satisfying gaming experience.
- NO MONTHLY FEES!!
As noted in the comments, someone who plays on an RP server in WoW gets the benefits of 1 through 4 even though they're playing an MMO/CRPG. If they're role playing in DDO, they get all five; if they're considering switching to a tabletop game of 4E the monthly fee is actually a disadvantage of the TABLETOP game, not the computer one.
Even if we assume that this list is a list of what differentiates CRPGs and tabletop games, advantages can often turn into disadvantages given the right situation. Items one and two locked me out of tabletop RPGs entirely a year or so ago. And items three and four are pretty easily debatable (the argument is between a free-form experience, versus one that's curated by an expert in the field... Prepublished module vs. homebrew campaign, if you will).
I think that with a tight scope ("I have a group of friends that want to start a group activity on the weekends. The group is something like [insert description here]. What are the advantages of starting an RPG vs. doing something in an MMO?"), we'd be more than qualified to answer this sort of question.
I also mentioned in the comments that I think the question would have been fine as a "fun" CW question (as long as it stuck to good-natured ribbing, and stayed a little way above pure flaming), or as a "how do I recruit MMO players to tabletops?" kind of question.