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We physically can't be, we are a massive island/continent with a population of 26,000,000 and a massive coastline, the numbers don't add up to being 'self sufficient', we need them and to make things even sweeter they need us as a bastion for the southern hemispere (in many ways). As said Presidents come and go, our agreement is stronger than all of them put together. China is still very much a threat to our security, just look at the South China Sea activity and State sponsored hackers.Morrison will breath a sigh of relief if Trump loses the next election. So will a lot of other leaders.
Will still should be more self sufficient on all fronts.