Assuming the populous to be eradicated is random out of the 50%, it would certainly be ideal to remove the males. To truly grasp what would happen in this scenario is next to impossible. Even if the remaining male population is still distributed in the same way (same proportion of attractive males to the unattractive) the law of scarcity will indeed make it much easier even for incels to finally have their chance, although I know many of us understandably feel otherwise.
Beyond that, and perhaps more importantly, the providing gender will no longer be able to meet the demand of the many luxuries and privileges foids are so used to. Society as it is structured now would not be able to operate losing so many men. Of course women will still have no physical attraction to the sub 5’s, however they simply will have no choice but to do whatever they can to find a new provider(s), as their large orbital will have been eradicated. The sexual market would be more similar to times before Jewish poisoning of the western world, think of how in the dawn of man it was much more important for women to find a permanent partner to care for her.