Guidelines for the Vaccinated

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Just saw today that more Americans have been fully vaccinated against COVID-19 (30 million) than have tested positive during the pandemic (29 million) 🙌

Also, the CDC released their much-anticipated guidelines for fully vaccinated people (i.e. 2 weeks after your final dose). If you've been fully vaccinated:

• You can gather indoors with other fully vaccinated people, or unvaccinated people from one other household, without wearing a mask (unless any of the unvaccinated people is at increased risk from COVID, or lives with someone who is).
• You don't need to quarantine if you had potential exposure to an infected person (unless you live in a detention facility or group home).
• You should still wear a mask, stay 6 feet from others, avoid crowds and poor ventilation, and avoid travel and larger gatherings.
• You should still watch for symptoms of COVID, especially if you've been around a sick person, and isolate if you have symptoms.
• You still need to follow guidelines at your workplace (and I assume other public places, e.g. wearing a mask in stores).

My biggest question is how long the vaccine's protection lasts, and how you can re-up after that. For example, will there be annual (or more frequent) booster shots? Can you mix the different brands and types of vaccines? Will it be as hard to get the boosters as it's been to get the initial shots, or will they have more convenient vaccines and simpler distribution methods by then?