It seems there are plans to move the Charedi Populations to Vienna, because of the generous benefits there.
I dont know who are the gevrim who are supporting the Yeshivas, But I am sure at least some of them are either Dati Leumi or even Chilonim (Many non-relgious actually do support religious institutions). I doubt these supporters will be too happy if the charedim move to Vienna of all places (Its not so easier to emmigrate to US for Israeli non-Us citizens and benefits are likely to be cut here as well due to political climate)
Probably many charedim will be forced to sell their apartments in a fire sale in order to be able to afford to move to Vienna further improverting them (They will need the money to pay for plane tickets and real estate in Vienna) I doubt many geverim will pay the millions required for this mass exodus along with the money required to build the yeshiva directly.