Well segwit is a precursor to any block size increase. Once it is in place, and once utxo set pruning is in place, then maybe we could start considering some (much smarter than BU, with actual thought put into it) flexible block size suggestions. With the current state of the network, some devs are saying that block size *decrease* is needed now to ensure network security.

So at this moment, it is outright irresponsible and dangerous for the network, that is why only people who have zero stake in bitcoin or people who invested heavily into ethereum advocate for it. They would be ok with bitcoin dead.