It depends on how long the PC remains open for. Right now, I hope the PC addition can get us into a position that 7 million is kinda reachable. If that happens, and the PC is announced to be ending, then we can run various campaigns and pushes to edge it over the line. But as I said, it all depends on when the PC ends.
If there's an E3 showing, that will also be a mega boost, and maybe they could steer the sales pitch towards a last chance to back the game for exclusive merchandise etc. 7 million isn't a complete impossibility.