Due to the political nature of Medicare coverage, I do not anticipate Medicare will ever go away.
Like all other government programs there is no doubt Medicare will continue to change and will cover fewer items and will shift more of the cost of care to the beneficiary in the form of higher deductibles and higher premiums.
While I am not an Oracle able to see into the future, I do not see Medicare going away. It may change from what we see today but some form of it will be available. There are never any guarantees and it is impossible to see that far ahead and give a definitive answer.
Now THERE is the question of the century! Whoever has the answer to that one gets a gold star. Personally, I can't imagine it going away, as no politician could possibly suggest that and get re-elected. A different question might be "What will Medicare look like in 20 years". Again, we don't have an answer - but I would say it will be here in 1 form or another.
Like all other government programs there is no doubt Medicare will continue to change and will cover fewer items and will shift more of the cost of care to the beneficiary in the form of higher deductibles and higher premiums.