I will have to cast my vote as to no. I have several points as to why.
- Some people do not want to be engaged with conversation of current twc or older twc
- What will the solution be for administration? Will we have more admins that we would need?
How would the database be migrated / merged?- Truly, TWCT and TWCC have 2 different community types (besides the fact that one is today and one is classic)
- There can't be a specific domain name like twctodayforums.com or twcclassics.com. This means additional costs.
- Additional hosting costs
- Only one forum software type can be chosen.
- What would happen to the people that are banned at TWCC and not TWCT, or vice versa?
- In my opinion, TWCC and TWCT are two different communities, and should remain as such.
Even though Martin has already answered your questions, I'd like to make a few points.
1 - I wasn't aware that people were required to participate in certain discussions here. Usually, when I see a topic that doesn't interest me, I don't read it.

4 - We brought back subforums for "current" Weather Channel discussions over a year ago. Current TWC content was also re-introduced to the site some time ago.
8 - They would still be banned.