It's more the fact that it would imply that it 'needs' 6gb and therefore the rumoured optimisations of Google are sadly like in the past when we've heard similar .. Just rumours.
Likewise 'if true' it could be seen as a clear admission of the ram issues present on current devices and doesn't bode well for an effective software update to said current devices to resolve the issue ... They'd essentially be SOOT.
I hope this rumour remains a rumour, there's not a chance in hell of them getting the system ram usage (just system load - not apps) down below 1gb like other flagship devices out now if they are doubling ram from 3 to 6gb ... If anything as said previously it implies an increased need ...