Depends.
Openreach are introducing a new ONTE that only has one port.
Do you really have the need for 2 330mbps connections 
I know right, we are heavy users here and Infinity 4 300Mbits is fine for us.
Also the new ONT even though they might only have the one out port which you connect to the WAN port of the router, there is nothing stopping the ONT passing all 4 connections through that port.
Has anyone actually checked the specs for the new ONT, the port might be a 10G, 1G etc port and they might bring a new bit of kit that splits them.
Paul