There a few weeks ago before it was this crowded and warned the family going for the first time in years ... it will not be the same especially without FP option (which we used often). Minimal dining, no entertainment, no characters, no FP+ .... the only way to get your monies worth is get in a line, ride, repeat. We spent four days in lines stopping only briefly to eat one meal a day. Any store we went in to for a brief cool off ... empty, CMs standing around, no buyers .... every time. So if you increase capacity without many other options, everyone will be doing the rides, every attraction will have lines, and less money will be spent.
The irony is all those who said FP+ is the reason for lines and look now that it's open we have none ... you wouldn't at 30-35% it was last year. Now that they are creeping it up to full capacity reality is that the standby can't hold everyone in the park and the attractions are mainly what they pay for. And when Small World is an hour, when POOH is an hour (my kids would never have survived that line) and every other decent ride in MK is close on an hour ... you just have to spend the day in line sadly.