Agreed. A quality multicart is really the better way to go. If one can be made that has the whole library on one or two carts, an Everdrive is pointless, or at the very least much less desirable.
Regarding if this would hurt independent NG development, I don't think it will. People that spend the money on these carts do so because having a physical, authentic product is paramount, in addition to voluntarily supporting the developers financially. There's also those that will buy them just to hoard them and flip them later, but even though that's another moral ball of wax, its another contributor to physical sales. Neither of those audiences will diminish because of ROMs or a multicart.
I think its safe to say the Neo community holds authenticity and physical product above all else more than any other gaming community by far.