Wouldn't fusion also mean net energy generation? Or at least much higher than inputs... So there should be lot more energy in system than expected.
National ignition facility (NIF) recently got exited about more energy out than they put in. They don't have a plan for #2 or #3- but as a research facility focusing on #1 thats OK.
Numerous tokamak designs try to handle #1 and #2, but handle #3 by putting rails into the reactor for robots to replace and repair things.
I'm very pessimistic about #3- nothing is immune to neutron damage from fusion, it's just engineering it to fail in a way thats useful. And, once the public accepts the problem, produces less nuclear waste than fission.