I liked the ending, but understand the thought that it was just a re-set leading into an endless loop.
But it doesn't. Because when Roland goes back, this time he has the horn that he didn't have the first time around. I took that ending to mean that at some retiration, Roland will not go to the Dark Tower, but will go with Susannah to the alternate world and be happy.
Or because he gets the horn, some of the other gunslingers don't die.
So, yes, it was a litlte disappointing to see him go back to the desert, but King did provie a point that things will be different.
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