Good luck, Sone Aluko and co - you're going to need it.
As and when the ink is dry on a £14m deal that takes the Scotland international to Championship rivals Aston Villa, Aluko and everyone is going to have to step up a notch.
So what's the future? Five points to consider.
The head coach said he would build a team around McCormack
In theory, Slavisa Jokanvic has to rip up that blueprint and start again. If all was to be channeled through a 23-goal a season forward, the gaffer now has to consider what on paper are lesser options.
You can't reproduce the McCormack mindset easily
Consider this. Fulham were struggling from around November when Kit Symons was sacked. But even so, the forward ignored all around him to get on with the job of banging in goals and providing for others, most notably Moussa Dembele.
It takes a special kind of resilience to focus when all around are losing their confidence and deal with the pressure of HAVING to score goals because the defence lets so many in - and a former Premier League footballer told me that.
The replacements - as they stand
No disrespect to Aluko and Floyd Ayite - but a glance at their records should furrow brows.
Three goals in 31 appearances last season for the former Tiger, remembering this was a Hull side on the up, is nothing to write home about.
Ayite has done well for Bastia. But this is Ligue 1 French football, played at half the pace of the Championship, and Corsica is not Cardiff on a February afternoon.
Matt Smith and Cauley Woodrow might relish their chances, but both, when fit, have been reduced to supporting roles so far.
The affect on the players McCormack leaves behind
The new boys carry no baggage from the past, but the rest depended on the Mac and Moussa goals to avoid relegation last season.
The jury is out on how they cope mentally with the knowledge their get-out-of-jail card has got out of Fulham.
At least Fulham are losing him at the beginning of the campaign
It's a clean sheet right now. It wasn't in January when Middlesbrough courted Mac the Attack. The one bonus, apart from £14m, is a door closing in one part of the Cottage, opens up another.
It also leaves the best part of a month to get a replacement. Patrick Bamford? Nahki Wells, anyone?