Actually, if BP does need another type of shul, why DAVKA does it have to take over the building of an existing one? Most alternative shuls start in basements or homes and then move on to properties of their own.
Someone probably should start an alternative shul in BP – and fast. But even if Beth El were available, it would be far too much for a new shul to handle.
On the other hand, if Beth El (which I don’t remember at all – my connection with Boro Park was mostly Sunday shopping) is practically empty, renting space to an alternative minyan might be a good idea for it to keep itself going.