Children are resilient. As aeh says above, optimizing for the whole family rather than just one individual usually brings the best outcomes. Also, while it is nice to have a PG friend who shares common interests, as others note these may evolve and there is a great distance between 5 and adulthood.
Your child lives in a world with lots of typical people... While it is lovely to connect with others at the far ends of the spectrum, there is immense value to developing relationship skills and true friendships with 'ordinary' people, and to learning to navigate the broader world. A change in situation will be different, not necessarily worse. Also, it's been my observation that broad-based relationship skills are really good predictors of how happy, fulfilled and successful adult life will be for gifted people.
Yes, but each imperfection adds to the loss of the potentiality at the highest end of achievement. Only by making each step perfect and keeping your balance on the tightrope for years on end can you arrive at the best possible future.
You may be "fine" but you will have fallen well short of your potential, and may ultimately become forever lost in the great sea of mediocrity.
Remember, each time you fail to achieve greatness, or even experience the slightest misfortune, many glorious possible outcomes are forever eliminated.
I would argue that this is far from the truth. Very often stumbles and falls teach resilience and a new perspective, and in fact they often provide a springboard to greater heights. Imperfections do not contribute to the loss of potential: they may in fact unleash it. Risk-taking is key for those who aspire to do great things... otherwise one ends up painting by numbers and focusing only on the next careful step.
Einstein did okay, after all.
