As someone who is building a startup that deals with slightly-more-than-usual data and who has been involved with various startups that similarly pushed the data-boundaries in later phases: Yes.
Make it work. Make it right. Make it fast. In that order.
Restructuring data is, in most cases, a smaller issue than it may seem. Running systems don't normally crash and burn over night. More often you'll see it coming and have plenty time to apply bandaids while transitioning to a new system.
Doing so is much easier when you can actually see and measure the bottlenecks, rather than trying to predict them beforehand.
Make it work. Make it right. Make it fast. In that order.
Restructuring data is, in most cases, a smaller issue than it may seem. Running systems don't normally crash and burn over night. More often you'll see it coming and have plenty time to apply bandaids while transitioning to a new system.
Doing so is much easier when you can actually see and measure the bottlenecks, rather than trying to predict them beforehand.
In other words: Embrace the limbo. ;-)