I'm always amazed every time Disney opens a new ride, land, theme park, etc the same "OMG CAPACITY IS TOO LOW HUMANITY IS DOOMED" arguments start up again. Or that people never just take a step back and A. realize this has been said for countless rides and lands in the past and B. It all eventually works itself out. This argument has happened from the Nemo subs to WOC. There is always the same internet hysteria that a hot incoming attraction is just not going to reach the same capacity as others and somehow chaos will reign over it.
I never get it, all it means is the lines will be longer for awhile. People seem to understand that and simply wait. If the ride is worth it, they will continue to wait longer for it. If its not, the lines will simply dissipate in time regardless. This is how its always been regardless how big or small capacity is. Notice no one is losing sleep over not being able to get a ticket to WOC these days or worrying if they will be able to ride RSR. I remember the hoopla over that ride and how 'low' the capacity was for an E-ticket. Remember that? Well apparently no one does because its never brought up today. Pre-opening though that's all people talked about. "Only 1500 people per hour??? POTC gets twice that many!!! What were they thinking??" Now no one ever brings it up or talk about it.
And here is another shocker, not everyone will want to ride these rides right away. If they don't want to wait in a 6 hour line, they will come back in a few days/weeks/months and ride when things calm down.