It depends. I would prefer my son is able to get vaccinated but he's 11, turning 12 in December. I have read that J&J and another company at least, are doing trials on children, I think the J&J will be trialing infants and up so I am hopeful one will be available for kids 6 to 12 by fall. It would also make me feel better about sending him to school. However, if enough adults are vaccinated I'm not sure it will be a problem.
Since we plan to cruise, I am assuming they do what RCL is in Israel, those 16 + have to be vaccinated (because that's what the one they are using is approved for). Those children under that age don't have to be but can still travel. If those are the rules, then we'll be going. So yes, I would travel without him being vaccinated, but that's provided most adults are. And "most" is not really a number per se, just the percentage at which we see the spread drop off. Does that make sense? Hope so