No its not.
sometime, someone is going to discover america.
england is so close to north america (which has sort of the same environment)
and the SE Asians had quite a few sea faring peoples. if one of them was to find gold in california.
plus i do believe that SE Asians and Native Americans had been trading for awhile, it just was consensual and nobody made a big deal about it "discovering new lands"
Yes, but not by the year 2012 if the cards are played right. Eventually, and eventually is between now and never.
England was so close but did nothing, and "so close" is more or less the entire length of europe with no land in sight unless you count Iceland and Greenland, which people didn't even inhabit until the Norwegians went there. England, however, was poor and economically dependent upon the mainland. It took centuries of economic buildup, and even then they merely followed the Portuguese and Spanish that came before.
There's a difference between sea sailing and transoceanic sailing. They had nothing that would allow them to do that without continuous resupply, which they were unlikely to find.
That's far more baseless an assertion than the Ming Treasure Fleet making it to the new world. You want to know the big reason for this? If that were the case then they would already have an immunity to most European Diseases. Livestock would move across the ocean and there would be clear traces of Asian goods. There is
none of that in the archeological record, and less than nothing to support such notions from the historical record.