There is no chance of this happening. Super hornet production is to cease in 2025. At best existing fleet gets upgraded to Block III std to extend airframe life.
I would be cautious of saying there is no chance. As recent history has taught us things can change rapidly. Only half a decade ago people where saying (my self included) that there would be no chance of Australia getting SSN's but not the case now. Highly unlikely? perhaps, but zero chance? No one here knows, And if any one has any insight they won't be saying a thing about it.
Edit: This topic has been covered several times and at the end of the day none of us know's what will happen. Will we get more of them, will we retire the SH early and get more F-35's, Will we keep the same numbers but hold onto them for now, No idea. If we go for more F-35's then possibility will be a bit of a wait time on them, At same time if we hold of and wait for the F/A-XX then may be able to get a 6th gen platform (Should not this platform is meant to replace the SH and Growler around the same time we plan to actually replace our Growlers assuming that is still going ahead). Many options, most well covered, Now its wait and see.