My understanding is that both will run only until all the bugs are out of V3. Of course, we're rushing things here since it's still in Beta and all the modules aren't in place.
"New" chess.com
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Will the new chess.com website eventually replace the curent "old" one, or will they run concurrently for the rest of time? I personally like the new one, although it takes some getting used to.
I just think it seems a waste of resources to keep both up and running forever.