They've invested too much time, effort, and money on developing a new client to turn back now - whether it's the primary concern of the players or not.
Do you have any actual evidence of this or just an email from SwC saying so? Maybe I should be less skeptical but at this point...
Rakeback will still be there, but it makes more sense to MASSIVELY DECREASE RAKE than to offer 50% tablestarter, which discourages 4+ games.
They could also do like UB did, where if you were one of the first two players at a table you got table-starter rakeback for an hour regardless of how many people joined.