This is a genuinely rubbish situation to be in - and the TT guys have my complete sympathy. As does any pilot worried about where the next pay cheque is coming from.
Given the clear directive from the Company to stop the outflow of cash at the moment - I think the Company will fight tooth and nail to not replace the current 737 guys. From a business perspective and a financial perspective, it makes absolutely no sense for them to train a 320 crew on to the 737 to then make a 737 crew redundant.
It would not be outside the realms of possibility for the Company to come out and say that if they are forced down that route, then the whole operation is not viable.